Trumps of Doom (Chronicles of Amber Series #6)

Merle Corey is a brilliant young computer designer in San Francisco, but, he is also Merlin, son of Corwin, vanished prince of Amber, and heir to his father's wonderous powers. And, someone is determined to kill him. Now he will begin a desperate race through Shadow, not only to escape the mysterious force that threatens his life, but to protect the deadly secret that could destroy both his worlds.