After treating an injured greyhound at her grandmother's veterinary clinic, thirteen-year-old Maggie learns about the abuse of greyhounds in the dog-racing industry and vows to put a stop to it.

Zoe must stay in Ambler with her grandmother and cousin while her mom films a movie. There she learns that several animals have been poisoned by antifreeze. Zoe and the rest of the Vet Volunteers try to raise awareness about antifreeze by doing public service announcements; and Zoe uses it as an excuse to get her mother's attention.