Meet Lizzie and Lucky: a sparky young detective and her loyal Dalmatian sidekick! Lizzie is desperate for a dog. In order to convince her parents to get one, she has to come up with 101 reasons why she needs one. Lizzie is a master at making lists, so thinking of 101 reasons is going to be easy! Especially as she could train one to be her hearing dog. But as Lizzie begins compiling her list, she witnesses an adorable puppy being snatched away and put into a van by a mysterious-looking man. Can Lizzie solve the case – and maybe find herself a loyal friend at the same time?