When Commander Thomas Pitt is ordered to protect a young woman visiting London from Spain, he cannot see why this is a job for Special Branch. When she disappears in the dead of night from Angel Court, however, he is faced with a dangerous mystery. Sofia preached new, and some say blasphemous, religious ideals, and her life had been threatened. But Pitt senses there is some deeper and more dangerous reason for her kidnap -- if that is what it is....