False Nemesis is the third in the de Lacy Mysteries by J.J. Campbell, in which we see a rather different side of amateur sleuth Charles de Lacy.
Following his run-in with London gangster Mark Whadcoat, de Lacy is left with a body on his hands. Things get even more complicated when some of his police contacts seek his help in order to claim a reward that the dead man's wife has offered for finding him. The only problem is that de Lacy was the last person to see him alive ... It will take all of the urbane investigator's charm and forensic skills to solve this conundrum.