Mace — Gale Stanley

In a secret military complex, a scientist uses genetic engineering to spawn a new breed of humans who can shape-shift into animals. One-nineteen, a bat hybrid, longs for his freedom, but when he finally gets a chance to try his wings, fear of getting caught forces him to hide in an underground cave. Brad Walsh is an experienced caver. His life is all about caving and exploring the unknown and untouched, but an accident leaves him trapped underground. Rescue comes in the form of a shy stranger, who calls himself Mace. Brad invites his rescuer into his home--and his bed. But he has no idea that his virgin lover is a shape-shifter who's on the government's most wanted list. For the first time in his life, Mace knows what it feels like to care about someone. He stays longer than he intended, and soldiers track him to Brad's house. He only meant to save the human, but now they're both in danger. Note: This book was previously published with another publisher and has been extensively revised and expanded.