Frequent hearses - Edmund Crispin

Stars, Starlets, Floozies and factotums to the film world - Gervase Fen suspects them all...The
young actress, Gloria Scott, drowns after throwing herself off Waterloo
Bridge. The news sends shock-waves around her film studio where Gervase
Fen, Oxford Don and amateur criminologist, just so happens to be
working. With help from friend the Inspector Humbleby, the tragic loss
of young life leads them to many more dark places. Young Ms. Scott's
apartment has been searched, and all signs of her real identity have
been removed, and what's more, minutes before Humbleby interrogates her
co-workers, one of them, a lecherous cameraman, is poisoned. Equal parts compelling, witty and ingenuous, this novel is a classic example of great British detective fiction. First published in 1950, Frequent Hearses was Edmund Crispin's seventh novel.