The Mark of Cain is a detective novel by Carolyn Wells, first published in 1993. The story follows Avice, a young heiress who investigates the murder of her wealthy uncle, Rowland Trowbridge, found dead in Van Cortlandt Park. As she navigates her grief and the complex dynamics within her household, including her uncle's fiancée and a stern lawyer, Avice uncovers secrets that may lead to the truth. This novel is notable for its early 20th-century setting and intricate plot that combines familial conflict with a classic whodunit structure.
