Trent's Own Case is a 1936 British detective novel written by E.C. Bentley (in collaboration with H.Warner Allen) as a sequel to his best-known novel Trent's Last Case

Trent's Last Case

Trent's Last Case is a detective novel written by E.C. Bentley and first published in 1913. Its central character reappeared subsequently in the novel Trent's Own Case and the short-story collection Trent Intervenes .-Plot summary:...

. The amateur detective, Philip Trent, investigates the murder of a cruel philanthropist

Philanthropist

A philanthropist is someone who engages in philanthropy; that is, someone who donates his or her time, money, and/or reputation to charitable causes...

 whose portrait he was painting. It was followed by a collection of short stories Trent Intervenes published in 1938.