The Case of the Barfy Birthday — Michele Torrey

Did Zoe really poison her twin sister Chloe? What's the best way to rescue a super-sized pig trapped in a deep, deep hole? And how can you stop a chilly ghost from wrecking a tree-house sleepover? Fifth-grade supersleuths (and science whizzes) Doyle and Fossey are about to find out -- and young readers will love learning the solutions!