The Amnesiac is a multilevel mystery.

When twenty-nine-year-old James Purdew returns to England from his home in Amsterdam, it is to discover what happened during three earlier years of his life that he cannot recall. What he finds, in an old house with a tragic history, is a nineteenth-century manuscript that begins to seem less and less like a work of fiction?and more like the key to his own lost past. Memory and amnesia, fiction and reality, destiny and randomness, heaven and hell.(from Amazon.com)

Highly recommend this one!!