Giles Dudley is called upon by his cousin Henry Wilton to assist him in San Francisco, but the reason for the summons is not at all clear. Dudley answers the summons, only to find himself immediately wrapped in the middle of mystery and intrigue, the roots and ends of which he is utterly unaware. He has been given to care for a mysterious young boy whom he hasn't even seen. His cousin has mysteriously disappeared. Dudley's role in the mystery has him convinced that as he goes about trying to assist his cousin with whatever it was he wanted to accomplish, he does so completely blindfolded.