As All Hallows' Eve approaches, Hettie Bagshot of The No. 2 Feline Detective Agency has more than just a ghost and a warlock tart on her plate. Upon discovering the body of Mavis Spitforce, Hettie and her trusty sidekick Tilly set out to investigate an old crime and a spate of new murders.

Why was Mavis Spitforce dressed for Halloween? Can Irence Peggledrip really talk to cats from the spirit world? And what's the connection to the legend of Milky Myers, suspected of murdering his family on Halloween, longer ago than anyone can remember?As the November fog closes in, can the tabby duo unearth the truth, and stop the murderer before they strike again - and will there be enough samosas to go round?