Thornley Colton, Problemist, is a 'blind detective' from the golden age of detective fiction - and among the very first in this fascinating sub-genre. Relying mainly on his enhanced senses and sharpness of mind, he only takes on the most mystifying of cases, strictly for the pleasure of unravelling a mystery. Whether it's the disappearance of a jewel from a locked room in front of witnesses; or the disappearance of a man under the eye of the Secret Service; or the Murder of a highly reputed Assassin from her locked hotel room, the Problemist will solve them all.