The Woman in White by Wilkie Collins
Read this sensational tale of madness, betrayal and greed. This novel has never been out of print since it was first published in 1860. It includes themes like marriages of obligation, claims and arguments over inheritance, and the victimization of women. With all of that it is fast paced and engaging mystery thriller.
Pick up what is often considered the first book in the mystery/thriller genre and see how it all started.