Book detail

En route to an archaeological dig in central Turkey, Dr. Lacy Glass befriends a poor bedraggled man who is about to be thrown off the train because he has no ticket. She buys one for him. Next morning, this same man goes flying past her train window--dead. Upon arriving at the dig, she learns that a man named Max Sebring has died there that morning. This is the name she found embossed in the collar of a trench coat the dead man from the train left behind. Who was the real Max Sebring?