Victorian adventuress Veronica Speedwell is whisked off to a remote island off the tip of Cornwall when her natural historian colleague Stoker’s brother calls in a favor. On the pretext of wanting a companion to accompany him to Lord Malcolm Romilly’s house party, Tiberius persuades Veronica to pose as his fiancée–much to Stoker’s chagrin. But upon arriving, it becomes clear that the party is not as innocent as it had seemed. Every invited guest has a connection to Romilly’s wife, Rosamund, who disappeared on her wedding day three years ago, and a dramatic dinner proves she is very much on her husband’s mind.

As spectral figures, ghostly music, and mysterious threats begin to plague the partygoers, Veronica enlists Stoker’s help to discover the host’s true motivations. And as they investigate, it becomes clear that there are numerous mysteries surrounding the Romilly estate, and every person present has a motive to kill Rosamund…

The house party with a twist is such a trope in old-timey feeling mysteries… and with good reason. Take a remote location, preferably in a house with some grandeur or mystique, add in a motley assortment of house guests, all invited for a variety of reasons, most of which end up being pretenses, maybe mix in some gothic family secrets… and bam! You’re all set up for a slightly claustrophobic, atmospheric whodunnit.

In the case of A Dangerous Collaboration, while the set-up is reminiscent of Agatha Christie, with perhaps a hint of Rebecca too, it’s a trope that works extremely well. We pick up with our plucky heroine Veronica Speedwell, already a world-famous lepidopterist despite being only in her mid-20s, and her dark and dangerous colleague Revelstoke Templeton-Vane, known as Stoker. The two have chemistry galore. When we last saw them in A Treacherous Curse, Veronice and Stoker had just solved a mystery involving plundered Egyptian tombs and Stoker’s notorious past… and were on the verge of a long-awaited lip-lock and possible confession of feelings, when they were interrupted by Stoker’s older brother, the Viscount Tiberius Templeton-Vane.

In A Dangerous Collaboration, we continue mere moments later. Tiberius arrives with a proposition for Veronica — to accompany him to a gathering at his friend Malcolm’s Cornish island castle, where she’ll be able to collect specimens of a rare butterfly previously thought extinct. Naturally, Veronica jumps at the chance, despite Stoker’s objections. So also naturally, Stoker shows up at the island too, where the two brothers and Veronica join Malcolm, his spinster sister, his widowed sister-in-law, and his nephew for a social gathering. At which point Malcolm informs them all that he needs their help — he wants to learn the truth of what really happened to Rosamund on their wedding day. Did she flee? Did she die? Was she murdered? There are some dark and disturbing possibilities, and all of the assembled guests, apart from Veronica and Stoker, seem to have much more at stake than is initially apparent.

The Veronica Speedwell books are utterly delightful, with their arch humor, constant sense of adventure, and layered mysteries to solve, all of which are enhanced a thousand times over by the sparks continually flying between Veronica and Stoker. While A Dangerous Collaboration felt at first a little tamer than the previous three books, probably because Veronica and Stoker did not appear themselves to be in mortal peril this time around, soon the danger grows and before long they’re once again risking life and limb to learn the truth.

Along the way, we get to know Tiberius better and understand what makes him tick, as well as gaining insight on the highly charged relationship between the brothers. For me, the most delicious part of the reading experience was the mounting tension between Veronica and Stoker, as they creep closer and closer to the point where they’ll just have to finally admit their feelings and declare their intentions toward one another. Like I said, these two — chemistry, sparks, fire, passion… you name it. (But no, there’s no graphic physical stuff, just tension and attraction galore.)

As always, the language and dialogue in these books is so much fun. A little sampling:

“What in the name of seven hells do you mean you want to ‘borrow’ Miss Speedwell? She not an umbrella, for God’s sake.”

Her doglike devotion was appalling; any woman with spirit or strength could only feel revulsion at the notion of offering oneself up like a sacrificial lamb to the slaughter of one’s own independent thought and feeling.

Men were a joy to sample, but a mate would be a complication I could not abide.

“Does this mean you will stop torturing me by displaying yourself in various states of undress?’

“Not a chance.”

At the end of A Dangerous Collaboration, we get a hint about what Veronica and Stoker’s next adventure will be in book #5. And now I’m jumping out of my skin, dying to read it NOW. This is really a terrific series, and I encourage everyone to start at the beginning and dive in!

Want to know more? Check out my reviews of the previous books in the Veronica Speedwell series:
A Curious Beginning
A Perilous Undertaking
A Treacherous Curse
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The details:

Title: A Dangerous Collaboration (Veronica Speedwell, #4)
Author: Deanna Raybourn
Publisher: Berkley
Publication date: March 12, 2019
Length: 336 pages
Genre: Historical fiction/mystery
Source: Review copy courtesy of the publisher via NetGalley