Nicki's life is in danger!

Christine's mouth fell open and her eyes bugged. "Behind you," she squealed. "Look!"

Nicki whirled around. Behind her something was rising out of the water—something big and dark sinister, with arms like a giant sea serpent!

Nicki Holland expected fun and sun in the summer before her eighth grade year—not mysterious strangers and counterfeit cash! Nicki, Meredith, Kim, Christine, and Laura are warned to leave the mystery alone. But when Nicki is threatened, she has to solve the mystery to save her own life!