After her father's death, eleven-year-old Rowan Graham wrestles with depression. Carolina, her mother, looks for a way to ease her daughter's grief and decides to adopt another dog. Rowan chooses a wolfhound-deerhound mix and believes she and the pup, Zephyr, communicate through mind-pictures, a phenomenon that her mom rejects.

While vacationing, the family is embroiled in a multi-car accident; Zephyr is pitched from the van and bolts into the wilds of central Oregon. Medics airlift comatose Rowan to Portland for head trauma care.

Best-selling author Moss Westbury is haunted by devastating nightmares. A veteran of the Afghanistan conflict, he writes to expunge his demons. When his nightmares are fueled by unfamiliar howling on his isolated land--neither wolf nor coyote--he sets out to find the culprit.

Unleashed is a story of devastation, courage, hope, and love, told through the eyes of Moss, Rowan, Carolyn, and Zephyr--each struggling to resolve challenges and fears.