>It's Christmastime, but something strange and sinister is in the air. Treacle, Cath's courageous black cat, can't see what it is, but he feels a dangerous presence out there in the snow-blanketed streets.

Aunt Astrid also feels dark ripples in the dimensions. The Greenstone witches suspect this creature is somehow tied to the disappearance of two high school students. Soon, one of them turns up dead, half-eaten.