The China Governess (Penguin Classic Crime S.)

Aristocratic scion Timothy Kinnit is about to marry the girl of his dreams, until rumors circulate about his parentage, and the bride's father puts a stop to the wedding. When Timothy becomes chief suspect in a housebreaking and a suspicious death, Mr. Campion agrees to look into the situation, and finds that someone is willing to go to some very ugly lengths to keep Timothy from finding the answers he needs.