The Assassin's Riddle

The only way to win this murderer’s deadly game… is to play along. Summer, 1380. Brutal and sudden death is not uncommon in the foul alleys and streets of London. The corpse of a clerk has been pulled from the Thames. They drowned, but not before receiving 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 bolt firmly embedded in his chest: a real mystery because the windowless strongroom was locked and barred