When Nell Pratt is invited to the beloved Philadelphia children's museum, Let's Play, for a sneak preview of a newly installed exhibit based on the Harriet the Hedgehog book series, she's in for quite a shock. In the middle of the visit, one of the installers gets a sever jolt from working on an electronically animated forest creature. He recovers, but when a second man gets zapped -- this time fatally -- it sparks a homicide investigation, with Nell right in the middle.
