Scurry: The Complete Trilogy by Mac Smith

A colony of mice in an abandoned house are struggling to survive a long, strange winter. The humans are all gone and the sun is rarely seen. As food becomes scarce and many mice fall ill, the scavengers are forced to search farther from their home, braving monster infested lands in search of anything that will help the colony survive another day. Being hunted by feral cats and predatory birds is part of life for these mice, but beyond the fences stalks something far more fearsome... 

All 3 books forming the complete Scurry Trilogy! 295 pages of story plus tons of concepts, character bios, tutorials and more!