The Bedlam Detective by Stephen Gallagher
This starts as an historical novel, set around 1910, about Sebastian Becker, a British detective who tried to make a go of it in the States as a Pinkerton detective. Due to murder he witnessed while undercover and the resultant threats, he and his wife have returned to England, alive and well, but rather diminished financially. he has taken a job as an investigator for London’s Bethlehem hospital (Bedlam). His task is to investigate wealthy eccentrics whose questionable mental health may render them unable to properly manage their affairs.
He has to juggle investigating Owain Lancaster, a Amazon explorer who took and lost his whole family in the Amazon jungle, his autistic son and his lack of funds while searching for a killer. Locals think it’s Owain Lancaster and they may be right. Pretty good read, with some interesting characters. 3 Stars.