Sworn to Protect by Susanne Matthews

Four years ago, a car accident robbed Nancy Frost of her child and her mother, taking what was left of her marriage with it in the process. A forensic accountant, she agrees to look at a company’s books in a divorce case, trying to find hidden assets, but her meeting with the lawyer goes terribly wrong when the restaurant is attacked.
The moment US Marshal Neil Copeland discovers his wife has been shot in a Baltimore restaurant, he rushes to her side, determined not to let her down again. As the police investigate, evidence suggests the attack was a ploy to hide a specific hit. When a professional assassin tries to kill Nancy a second time, it’s clear that she was the target and whatever’s going on is a lot more complicated than they think.

When Nancy awakes after a month in an induced coma, not only does she not remember the attack on the restaurant, she doesn’t remember marrying Neil.
Faced with the challenge of protecting his wife from a powerful, faceless enemy, Neil must bring her up to date, dredging up all the sorrow that tore them apart in the first place, hoping something will jar her memory.
As he races against time, can he save her from an unknown assassin and convince her to give the love they once had a second chance?