On the Town by Susan Amanda Kelly

When Crash Coolidge, ex-biker, ex-Special Ops, ex-assassin, decides to marry the woman he gave up crime for, he doesn’t expect the proposal to be simple. Change makes his woman anxious, but she loves him right down to her tiny, sweet bones. He attributes the neck prickle that usually warns him of impending danger to nerves and plans a night on the town.
Mary Holmes, senior accountant extraordinaire, is happy. She has a promising job, wonderful friends, a smelly dog and a dangerously sexy boyfriend. Life is so perfect it scares her. It wasn’t always this good. So when Crash upends their date-night routine with new clothes, a new venue and his odd, edgy mood, her anxiety spirals out of control. It doesn’t help that she left her underwear at home as a Sexy Surprise or that Crash knocks out a flirty stranger. An armed, flirty stranger.
They uncover a crime-in-progress in the dimly lit club. The consequences will be deadly. Crash has two priorities – get his woman the hell out of there and get her to say yes. But Mary can’t turn away from people in trouble, and Crash can’t turn her down. Together, they hunt a mystery target who proves he’s willing to kill.