Publisher: Constable (Trade Paperback – 12 August 2025)
Series: Washington Poe – Book Seven
Length: 390 pages
My Rating: 4.75 out of 5 stars
One of world’s most outrageous and entertaining thriller writers, M. W. Craven, continues one of his best series in impressive fashion with The Final Vow, a captivating and highly addictive novel that I couldn’t get enough of.
M. W. Craven is an outstanding author who has written a truly interesting array of thrillers throughout his career. This includes his original Avison Fluke series, as well as the great action-focused Ben Koenig series, the latter of which I have deeply enjoyed in recent years thanks to amazing books like Fearless and Nobody’s Hero. However, his main body of work is his excellent Washington Poe series that started back in 2018 with The Puppet Show. Following a grumpy but skilled detective who gets partnered with a brilliant prodigy to solve the country’s most complex crimes, the Washington Poe novels are quite exceptional. I personally fell in love with the series when I read the dark and intense novel, The Mercy Chair. A particularly clever read loaded with an overabundance of well-thought-out twists, The Mercy Chair was an exceptional read, and it ended up being one of my favourite books of 2024. As such, I have been quite eager to continue the Washington Poe books, and the seventh entry in the series, The Final Vow, was one of my most anticipated books of 2025.
The people of England are living in a constant state of terror. A murderous sniper is stalking the nation, shooting people at random and leaving no evidence behind. This brutal shooter has so far killed over a dozen people throughout various parts of the country, never missing and always killing those who least expect it. With the entire population locked down and hiding in their homes, the police and government are so desperate for results that they turn to the unconventional team of Detective Sergeant Washington Poe and his genius partner Tilly Bradshaw.
After their last major case saw Poe reassigned to the worst position in UK law enforcement, and Bradshaw snapped up by the country’s intelligence services, the two seem like an unlikely choice to save the day. But with the help of their squad leader, Detective Chief Inspector Stephanie Flynn, there is no duo who stands a better chance of finding a killer who seems to strike completely at random.
However, as Poe and Bradshaw begin their investigation, they find themselves tracking a particularly skilled and deadly killer seemingly capable of countering all their moves. Forced to rely on unconventional methods and Bradshaw’s out-of-the-box conclusions, the duo soon finds themselves narrowing in on the shooter and identifying his sinister motives. But identifying the killer and capturing him are two very different things, and if they want to take him down, Poe knows he’ll have to make things personal, no matter what it costs him.
Craven continues to showcase why he is one of the world’s best rising thriller authors, as The Final Vow was a particularly powerful and impressive read that I had such a brilliant time with. Featuring a deeply compelling story, loaded with unique characters, complex motivations, and fitted with the author’s slick humour, The Final Vow was an incredible read from start to finish. I flew through this book in less than a day, it was that damn good, and I’m still thinking about its cool twists and reveals.
The Final Vow proved to be an extremely entertaining read, and it had one of the more unique and memorable thriller narratives of 2025. Starting off with a dark hint of events to come, Craven soon perfectly sets the terrifying scene for the novel, with the country shuttered by fear thanks to a deadly sniper. With the government desperate to stop the killing, they reluctantly bring back Detective Sergeant Washington Poe, whose reintroduction here was particularly entertaining and does a good job highlighting his unorthodox style. Once again teaming up with anti-social genius Tilly Bradshaw, Poe and his other police colleagues begin their unique investigation into the crime. Using some very interesting tactics while the body count from the sniper continues to rise, Poe and Bradshaw are soon able to determine the killer’s focus, which allows them to identify who the shooter is. However, uncovering their target’s skills, background and outrageously over-the-top motive completely changes the entire story, and forces the protagonists into a particularly deadly hunt.
Craven keeps up the intensity and complexity of the plot into the second half of The Final Vow, as Poe uses his new information to try and find the killer. However, after some very tense scenes and some surprising tragedy, Poe decides on a risky gambit, and makes the killer very angry by publicly humiliating him in a glorious scene. This results in an interesting final third of The Final Vow, which goes in some dark directions, while also setting up for a big final confrontation. I must admit that while I did enjoy how this final third of the book came about, I saw the author’s big twist coming from a mile away, which removed a lot of the emotional impact Craven was hoping for. Still, it was very entertaining and compelling to see this twist play out the way it did, especially as Craven also utilised an extended sequence showcasing the background behind the twist. While this behind-the-scenes section of The Final Vow is a little self-indulgent, it does provide some interesting context and entertaining character interactions, while also showcasing how easy it is to control public perception. This leads up to a heartfelt final sequence of the book, which is a nice reward after the very dark narrative that makes up most of The Final Vow, and readers will come away from this book very entertained and extremely satisfied.
The Final Vow proved to be another awesome read from Craven, who manages to ensure that this book is somehow simultaneously dark and thrilling while also being highly entertaining and a little light-hearted. The entire set-up for The Final Vow is extremely shocking, with a calculating sniper killing seemingly at random, and creating a palpable atmosphere of fear across the entire country. The tension and terror that inhabit the scenes where the killer strikes are quite exceptional, as is the impact his shots have on the witnesses and the public. However, Craven matches this excellent tension with the outrageous and over-the-top, both in the actions of the protagonists and in the crazy motivation of the antagonist, which alters much of The Final Vow’s underlying feel, turning it into quite a zany book at times. This underlying lightness does disappear at key moments, especially when the antagonist strikes at the main character’s heart, and there are some dark sequences throughout that will keep the readers on the edge of their seats. Combine that with Craven’s constant fast-paced revelations, clever investigation elements and great character work, and The Final Vow turns into quite an addictive read where you never know what is going to happen next.
Despite being the seventh book in the Washington Poe series, The Final Vow works well as a standalone novel, which is how Craven generally intends his novels to be enjoyed. New readers can easily jump into The Final Vow with no prior knowledge of Craven’s previous works and still get swept up in his entertaining storytelling, and this is a very fun author to read for the first time. While a great standalone novel, established fans of Craven and this series will probably get a little more out of The Final Vow, mainly because those readers will have a little more knowledge of the damaged protagonists, and the established relationships that they have. Watching these character elements, especially between Poe and Tilly, continue in this new novel hit a little harder if you’re already familiar with it, especially during some of the darker moments of the plot. Craven also makes some compelling references to the previous novel in the series, The Mercy Chair, throughout The Final Vow, including the utilisation of a very distinctive character from this earlier book, who has a great Hannibal Lecter inspired role in the plot. I felt this character’s inclusion was very fun, and readers familiar with their interactions with Poe in The Mercy Chair will appreciate how they continue to be used here. Throw in the utilisation of a character from another one of the author’s series, and The Final Vow is a book that Craven fans are going to have a lot of fun with, while still appealing to a wider audience.
The characters of The Final Vow were also a great highlight of this novel, and I loved how entertaining and outrageous they are at times. The continued antics of maverick cop Washington Poe and his unlikely offsider and best friend Tilly Bradshaw result in most of the book’s fantastic humour, especially when the characters are forced to interact with police and characters unfamiliar with their style. However, I really do have to highlight the antagonist of The Final Vow as my favourite character of the book. The deadly sniper who has single-handedly terrorised England with their killings works well as a fantastic villain for Poe and Bradshaw, especially as you quickly become aware of how clever and deadly they are, and they prove to be a great equal to the protagonists. However, it is their underlying motivations that really showcase just how despicable they are as a villain. While I don’t want to give too much away here, as discovering their motivations is such a fantastic part of the experience of The Final Vow, the sheer pettiness behind their actions really goes to showcase just how twisted and dark they really are. Combine that with their desire for revenge at any perceived sleight, and the lengths they will go to destroy their opponent, and this killer truly is an outstanding villain for the narrative, who you can’t help but be impressed with. This great combination of wacky protagonists, an over-the-top antagonist, and an excellent collection of supporting characters, including some recurring figures from the previous books in the series, and The Final Vow’s cast added a lot to the overall impact of the book, and it is going to be interesting to see where some of these characters go next.
M. W. Craven continues to shine as one of the more inventive and entertaining thriller writers currently release awesome tales. His latest novel, The Final Vow, was a particularly fun and exciting read, that perfectly combines its tense and deadly narrative, with the fun antics of its outrageous cast. I powered through The Final Vow in no time at all, and this was such a great novel that will appeal to a wide range of readers. I cannot wait to get my hands on the next Washington Poe novel later this year, and I’m sure it’s going to be another exceptional read.
The Unseen Library 