When Rider takes the P.I. Pack to a ski resort on vacation, they get caught up in a Snowbot mystery, instead.

In the small California town of Raincroft, the bonds of love and family are stronger than the influence of all outsiders. Past hurts are healed and new connections formed on Mystery Mountain as Beth, fleeing her domineering stepfather, is welcomed to Raincroft and Laura seeks to overcome her abusive marriage and befriend Missy, a timid three-year-old. As Laura gains Missy's trust, she bandies with Dr. Grant, whose methods differ from her own. But when Missy goes missing in a canyon, will Laura's fear of men turn out to be justified? Can Laura's tenuous friendship with Dr. Grant survive the ordeal? Will Beth adapt to her life in Raincroft, or will her crimes divide the family? Discover the hard and passionate life of mountain living that goes from deep canyons to mountaintop adventures, from wrestling wild animals to cradling a disfigured stroke victim. Mountain people take care of their own and do what needs to be done, as you will learn when you follow the excitement in the saga of Mystery Mountain, an inspiring tale by Marie Grace, and uncover the heart of Raincroft, a true mountain town.

In this sixth installment of the Pup Detectives graphic novel series, the pup detectives dig up the secrets of Mystery Mountain! Rider Woofson and the other pup detectives are excited to be going on a class trip to Mystery Mountain with the rest of Pawston Elementary. After all, with a name like that, the chances of finding a thrilling new case seem pretty good! But when the PI Pack arrives at the top of the mountain, they discover that all of their classmates have been scared away by a snow monster! Rider and the other detectives smell something fishy and decide it’s time to investigate exactly what’s so mysterious about Mystery Mountain.

As per the calculation of certain discerning sages of the yore, the earth is likely to pass through the path of large comet fragments and astral debris in the next few years. Such a cataclysm can engender widespread devastation for all species and decimate human civilisation. After solving the uncanny mystery behind the disappearance of a few botanists, Chef Lisa and Botanist Arjun incidentally get paired up with an impassioned archaeologist. Together, they set out to unearth the clues that would lead them to an intriguing, esoteric technology, which might neutralise the impact of the impending cataclysm significantly. Pitched against a global criminal force and a multitude of challenges, they travel to different continents to explore the sites of antediluvian civilisations in their quest for global safety. Guided by the wise ones of a pre-historic tribe of Peru, the series of revelations that they unravel is beyond their wildest imagination.