When the staff of Witches Incorporated receive a visitor from an alternate reality, they are shocked to learn that life in the parallel world next door is anything but a bed of roses ... and it's all because of Gerald Dunwoody.

At a crucial moment in time, their Gerald turned left ... but the alternate reality Gerald turned right. Now the parallel world next door is in the grip of terror, staring down the barrel of a thaumaturgical war — a war that threatens to spill across the dimensions and plunge every reality into a nightmare.

The only person who can stop a rogue wizard gone mad is another rogue wizard. But what do you do when another rogue wizard can't be found?