It was more than just a one-night stand.
Chelsea was there for me when I needed her. Now, she's the one who needs help. Luckily, I'm just the man for the job. MI6 and their orders be damned. She's worth going rogue for.
Spy for Hire contains an HEA with NO cliffhanger.

Spy for Hire is a full length romance novel, part of the For Hire Series, a loose spin-off of Cat Johnson's Hot SEALs series with appearances by favorite characters. You do NOT have to read any other books in either series to enjoy Spy for Hire.
Tristan and Chelsea first meet in Hot Chick for Hire. Though I recommend you read Hot Chick for Hire first, you can definitely read and enjoy Spy for Hire as a standalone novel.

FOR HIRE SERIES
Billionaire for Hire (Book 1 Brent)
Hot Chick for Hire (Book 2 Chelsea)
Spy for Hire (Book 3 Tristan)