Collaring Colleen [Tales From the Lyon's Den 2] (Siren Publishing Menage Everlasting)

Dr. Colleen Duncan is certain someone at the Lyon’s Den knows where her sister is. Instead of Mercy, what she finds at the private BDSM club are two P.I. Doms willing to trade lessons in submission for their efforts to find her sister.

Daniel Welsh and Rob Conrad know a sub when they meet one, and that look is all over Colleen. A gifted trauma surgeon, the woman is clearly frightened out of her wits at the disappearance of her younger sister, Mercy.

As the men help Colleen reveal her inner submissive, they also bring more than their own expertise to the case. They enlist the aid of two other Doms with investigative backgrounds who met, and were very drawn to, Mercy.

It doesn’t take them long to learn something substantial...and worrying. Someone else is looking for Mercy, too, and that can’t be good. There’s no time to waste. The clock is ticking.