A night he can't forget five years ago. Nick Markovic found himself consumed by his quest for vengeance. The one time he managed to find peace was in the arms of Hayley Dalton. Being with her was like bathing in sunlight, and he ached to feel that again, but he couldn't. He gave his oath to Hayley's cousin Desiree, his partner at McKay-Taggart and Knight, that he'd never let his darkness infect Hayley's innocent world. A spark she can’t put out. It was years before that Hayley offered everything she had to Nick.

Kayla Summers was an elite CIA double agent, working inside China’s deadly MSS. Now, she works for McKay-Taggart London, but the Agency isn’t quite done with her. Spy master Ezra Fain needs her help on a mission that would send her into Hollywood’s glamorous and dangerous party scene. Intrigued by the mission and the movie star hunk she will be shadowing, she eagerly agrees. When she finds herself in his bed, she realizes she’s not only risking her life, but her heart. Protecting Joshua started off as a mission, until it suddenly felt like her calling.

Since losing his twin brother, Theo, in the line of duty, Case Taggart has felt dead inside. The former Navy SEAL has dedicated himself to his family and their business, but he can't help but feel stuck as he watches everyone else move on with their lives. Only meeting the beautiful Mia brings Case out of his misery, until he discovered she was just a reporter looking for a story. Betrayed, he turned his back on her and never looked back.

After a major loss, Brody Carter found a home with the London office of McKay-Taggart. A former soldier, he believes his job is to take the bullets and follow orders. He’s happy to take on the job of protecting Dr. Stephanie Gibson while the team uses her clinic in Sierra Leone to bring down an international criminal. What he never expected was that the young doctor would prove to be the woman of his dreams. She’s beautiful, smart, and reckless.

MI6 agent Damon Knight prided himself on always being in control. His missions were executed with cold, calculating precision. His club, The Garden, was run with an equally ordered and detached decadence. But his perfect world was shattered by one bullet, fired from the gun of his former partner. That betrayal almost cost him his life and ruined his career. His handlers want him to retire, threatening to revoke his license to kill if he doesn't drop his obsession with a shadowy organization called The Collective.