Book Three in the Ink and Kink series.

Phalen, a former Army Ranger turned PI and tattoo-shop owner, is a Master waiting for someone to challenge him. Submissive-in-denial Cassie is the perfect partner in lust. Having been out of town for a case, Phalen returned determined to claim his woman and discovers she's more open to BDSM than he'd hoped. He couldn't be more turned-on.

Then Cassie nervously reveals her submissive twin sister may have been killed by an abusive Dom, who died shortly after. Despite the fact that her family and the cops believe their deaths were murder-suicide, Cassie hires Phalen to find the truth.

While he investigates a cold case, their relationship scorches the bedroom and his dungeon. But when his investigation points toward someone close to Cassie, she's caught in a psychopath's web of lies. It'll take all Phalen's skills to unravel the clues—and save Cassie's life.