Veronica Speedwell returns in A Sinister Revenge, the eighth mystery in a series best described as Agatha Christie in the world of Victorian science and natural history. Natural historian and butterfly hunter Veronica has been separated from Stoker, a fellow scientist who had become her sleuthing partner and lover. But Stoker’s brother Tiberius, Lord Templeton-Vane, reunites the couple by giving them a dangerous new case to solve.  In his youth, Tiberius ran with a group of students who called themselves the Seven Sinners, but then tragedy struck at his family’s Devon estate when one member of their party died in an accidental fall while trying to claim a fossil from a cliffside. During the following years, two other members also met an early demise, and now a threatening letter has Tiberius believing that they may all have been murdered by one of their own—and that he might be the next victim. In a Christie-esque conceit, Tiberius invites the remaining members of the Seven Sinners to an elaborate house party, where he plans to confront them and, hopefully, where Veronica and Stoker will uncover the murderer.  As the house party unfolds, it becomes apparent that the history of the Seven Sinners is more complex than Tiberius let on, with secret affairs and bitter jealousies complicating the past. Even as Veronica untangles the web of complex relationships, she struggles to reconcile Stoker’s distance from their own romantic partnership. As usual, Veronica’s keen observations and sharp wit contrast with her own occasional lack of self-awareness (especially when it comes to romance), making for a delightful read. Longtime readers of the series will be pleased to see regulars such as intrepid reporter J.J. Butterworth and ingenious chef Julien d’Orlande return. But ultimately, Raybourn’s masterful entanglement of Veronica and Stoker’s love story with the mystery at hand makes A Sinister Revenge a standout entry in an already excellent series.