The Alpha's Secret

Werewolves mate in threesomes in this world where packs operate just under the surface of everyday life.  Private investigators Gavin and Liam find their mate, Bridget, while on a case.  But in spite of the mating lust riding all three of them, Bridget resists the urge.  Something stronger than the mating lust keeps her from committing.  Meanwhile, Gavin and Liam discover treachery in her past.  Can they unravel the clues to both mysteries so all three of them can come together at last?