Sorcerer's House — Gerald Verner

Sinister events in the village of Ferncross have given the inhabitants good reason to respect the legend surrounding derelict Threshold House: whenever a light appears in the window of the Long Room, they know from experience that a corpse will be found the next day. For two years the mystery has remained unsolved - until there comes a time when the killer strikes once too often. Because helping the police in their investigation of the latest murder is the unorthodox but astute Simon Gale...