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Pretentious schoolgirl Deirdre Shannon's parents are throwing a huge costume party to celebrate her eighth birthday. There will be exotic treats, a pool in the backyard, a DJ, and a spectacular show by Marissa the mermaid. But the party is spoilt by a snake that someone threw into the pool and scared all the guests.

Best friends Nancy, Bess and George take on this mysterious case. Who would want to hurt Deirdre? Although it seems that half the city is angry with the capricious birthday girl.