Horace and the Christmas Mystery

Horace the haggis gets a shock when he visits his friends on Christmas Eve. Every one of them has vanished. Worse, pinned to each house is a note with the single letter V - the personal sign of the most feared gangster in Acre Valley. What has happened to Martha, Ferdy, Dijon, Doc Leaf and Professor Nut? Can he and Major Mole find them in time?