Enthusiastic sidekick Hamisher the hamster and reluctant detective Sasspants the guinea pig investigate when their beloved home--Mr. Venezi's pet shop--is vandalized.
Guinea pig Sasspants knows something is wrong with ninth-grader Viola, the new pet shop assistant, so when Mr. Venezi goes missing Sasspants and Hamisher put their private investigation skills to the test.
When guinea pig Sasspants leaves Mr. Venezi's pet shop to live with Detective Nichols, and hamster-detective Hamisher retires, the case of the missing bookstore cat must be solved without their help.
"Sasspants, Hamisher, and company have never been so raucous at the Mr. Venezi's Pets And Stuff pet supplies shop. This time, there's scuba-diving in the fish tank with the Steves, what appears to be a dragon hiding behind the counter, and Mr. Venezi's insistence that the store has been robbed of exactly sixty-four dollars and forty-two cents"--