When Rider Woofson and the P.I. Pack arrive at the top of Mystery Mountain, they find their classmates have left, scared away by a snow monster, so the detectives decide it is time to investigate exactly what is so mysterious about this mountain.

Rora and the other Pup Detectives work to stop an art heist and prevent Rider from being framed for the theft.

"When a beloved team mascot goes missing just before a big soccer match, the pup detectives are called in by the principal to crack the case!"--

"Puppy PI Rider Woofson thought he was the only detective at Pawston Elementary, but while bringing down a pencil theft ring, he finds out that there are other super sleuths at school. Fortunately (or not!) there's plenty of pet-ty crime happening at Pawston, so Rider joins forces with the other puppy PIs to form the PI Pack--the best (and only!) detective group at school. Their first case is high stakes because it hits every student in the belly...a...