Hazel has an impressive command of the English language for someone so young-especially when that someone is a mouse. She does not chat with humans, however, as mouse-killers are beneath her. Still, when Olivia Bent, the snobby young woman who lives in Hazel's house announces that she and her BFFs are spending a weekend at the beach, Hazel decides to stow away in Olivia's makeup kit. Even mice need a vacation.

Fun times turn tragic when a man turns up dead, and all eyes turn to Olivia as the most likely suspect. Only Hazel knows who the murderer is-will she reveal what she saw? Or will she leave Olivia to hang by her mean-girl rope?