"The dogs and cats of the world are not our friends. They presume we are always guilty of some crime or other, even if this isn't the case. You'll have to remember our most important code: look out for ourselves." - Meeka Chase, Mouse and potential Rat King.

Rats and mice live in the margins of the empires of dogs and cats, with homes that connect to the Underneath - a vast collection of warrens, tunnels, caves, and other hidden places. It is a dangerous place full of unexplained phenomena and terrifying creatures. But it is also full of wonders of ages past and the thrill of discovery. For the rodents believe Man was part of something called Science, a way to learn power through study, observation, and experimentation. Perhaps through the exploration of the Underneath, they can rediscover Science. It's time to listen to the squeaks in the deep. Squeaks in the Deep is a chronicle sourcebook for both Pugmire and Monarchies of Mau. It's usable with either game, or as part of a joint experience. Some highlights include: Two new species for players to portray: rats and mice. Six new rodent callings. Psionic rules. Information on the Underneath, as well as a variety of new enemies. "Confluence of Cults," an adventure featuring the Underneath with both Pugmire and Monarchies starting points.