Another complicated case peppered with a lot of interesting history about London and various serial killers stretching back centuries. I thought this was okay, although not as intriguing as the first three books in the series. (You don't need to read them in order, although there are passing references to the previous cases in this novel.)
This is a book club edition.
Old age can't stop cantankerous detectives Arthur Bryant and John May, the most senior members of London's Peculiar Crimes Unit. The quirky division, whose unorthodox methods have long made it the bane of the city's Metropolitan Police force, takes pride in tackling fiendishly clever crimes. Their latest case concerns the murder of a performance artist whose body was found in her latest works of art: a 12-foot-high tank of liquid containing six aborted fetuses. More murders put the two no closer to solving the case, whose suspects include members of a teen street gang and a mysterious cloaked figure sporting a tricorn hat and black mask. Meanwhile, the Peculiar Crimes Unit, still haunted by the unsolved matter of the Leicester Square Vampire, must prove itself worthy before cost-cutting bureaucrats shut the division down for good.