London of the Restoration era. A city in which a mysterious killer is hunting for royal judges! The famous lawyer Sir Orlando Trelawney and his friend, a Jesuit monk and at the same time a brilliant amateur detective, Father Jeremiah Blackshaw, begin an investigation into the murders. Soon they understand that the main suspect in this case, a dashing Irish mercenary, is clearly innocent of anything - except for communication with the royal favorite. But who is the criminal then? How did he manage to expose the unsuspecting Irishman to attack? And most importantly - why is the elusive the murderer takes revenge on the royal judges?! The adventures of Sir Orlando Trelawney and Father Jeremiah Blackshaw will not leave any fan of a good historical detective story indifferent!