The Z Murders
by J. Jefferson Farjeon (Collins Crime Club, 1932)
audiobook read by Tim Bentinck (Soundings, 2020)
A bit of a hot mess. Detective Inspector James does very little while tally-ho protagonist Richard Temperley goes all in on blind-faith instalove, his romantic interest acting inexplicably until the sinister, shadowy villains get together at the end for an expository powwow.