While You Were Spying by Stina Lindenblatt

She needs a fake husband. He needs to protect his best friend…

Ever since I caught my boyfriend getting hot and steamy with another woman, I’ve thrown myself into my career. But now I’m ready to move from being the super-efficient office manager to an operative with Quade Security and Investigation.
Just as soon as I prove to my boss that I’m kick-ass enough to do the job.
So when my grandmother asks for my help, there’s no way I can say no. Her former love has a mission for Jayden—my hot colleague and best friend—and me. What more could I want?

***
The last thing I want is for Isabelle to be is an operative. She’s my best friend, and I hate the idea of her being in danger. Unfortunately, our boss has other plans.

Isabelle and I go undercover at a resort for happily married couples. But forget moonlight walks and hanging out by the pool. To maintain our cover, we have to participate in activities that would make a nun blush.
Clothes come flying off, and we agree to temporarily be friends-with-benefits while there. No strings attached. No complications. Nothing could be simpler. Right?
Wrong—because there’s another reason we’ve been lured to the resort. A reason that will put our hearts to the test…and our lives on the line.