Fading Shadows by Kathleen Brooks

Edie Wecker returned to her hometown of Shadows Landing a couple of years ago after her husband was killed in action. She had been trying to put the pieces of her life back together. Agreeing to take a trip to Europe was the first step in reclaiming her life. What Edie didn’t count on was meeting someone who made her heart beat again.
Tristan Durand is only sent in to do the deadliest of work for his small European country of Millevia, and this time he’s told it’s the most important assignment of his career. Tristan had a contingency plan for everything, except meeting a beautiful woman at a café that would not only change his entire life, but now possibly end it.