First Lie Wins by Ashley Elston

Evie Porter is thrilled that her relationship with Ryan is getting serious and that he's asked her to move in. However, her excitement isn't for the usual reasons--she's been hired to get close to Ryan and report back to her boss, Mr. Smith. In fact, Evie is not even her real name. First Lie Wins is a fast-paced novel with many twists and turns as Evie tries to stay one step ahead of those who are out there to take her down. A great read-alike for Liv Constantine, Julie Clark, and Greer Hendricks.