LAST YEAR, PERCY JACKSON finds himself in a new adventure as he tries to gain three endorsements from the gods before he graduates high school. With the help of his friends Annabeth and Grover, they take on the task of watching over the pets of the goddess Hecate during Halloween.

The rules are simple:

• Take care of the pets as if your life depends on it.
• Don’t touch anything, especially Hecate’s magical potions!

However, when Grover’s curiosity leads them into unpredictable situations, the three friends will find themselves facing a giant goat and the goddess's terrifying pets running loose in New York City. Now they have twenty-four hours to restore order or face the wrath of Hecate.