Twelve year old Witchling Seven Salazar wants to be anything but a Spare witch. But during The Black Moon Ceremony when every Witchling in the magical town of Ravenskill is placed in their coven, that's exactly what happens. Joining Seven in this coven of unwanted witches is Valley Pepperhorn, self-styled monster hunter and giant bully, and new witch in town, Thorn La Roux, a master with a magical needle and thread who has a terrible secret. Unfortunately, it gets worse.
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When their coven does not seal, and their magic is in danger of being stripped away, Seven invokes the dangerous Impossible Task, a magical contract with a high price. Now, it's up to the Witchlings to fell the elusive Nightbeast, or risk being toadafied.