Out of Bounds — V.M. Black

All the former SEAL shifter Chay wanted was to save Tara from the panther within that threatened to consume her. But the bargain he strikes sets off a chain of events that threatens the safety of the Earth itself.
With the Army at the door of his precious facility and monsters from another world breaking through inside, Chay and Tara must face the challenge of their lives if they hope to ever find peace.