A Rather Unique Shade of Purple is one of a number of stories in the Doctor Goodier and Harry Mysteries compilation.
Clocks, Watches, two devoted sons and the blood-spattered corpse of their Father, whose suicide opens the door to a past no-one knew existed. But did the kindly Watchmaker pull the trigger himself? As Doctor Goodier discovers, the man was entirely alone in the room when the shot was heard, so death by suicide would appear to be the obvious verdict. Miss Scattergood, the Watchmaker's neighbour was away from home, so can't possibly know. Except that what she has to say turns everything on its head!