Assassin's Riddle

It's the summer of 1380 and the corpse of Edwin Chapler, clerk of the Office of the Green Wax of the Chancery, has been pulled from the Thames: Chapler has drowned, but not before he received a vicious blow to the back of the head. Then Bartholomew Drayton, a usurer and money-lender, is found dead in his strongroom, a crossbow firmly embedded in his chest: a real mystery because the windowless str...