FBI Special Agent Kyle Manning has spent his career chasing shadows, taking down criminals, and keeping his emotions locked away. But when he's assigned to a high-stakes undercover operation, he finds himself partnered with Special Agent Olivia Reed-a brilliant, fearless agent with a reputation for getting the job done at any cost. As they dive deep into their mission-posing as a married couple to infiltrate a dangerous crime syndicate-Kyle and Olivia quickly realize the most dangerous thing they're facing isn't the criminals around them, but the undeniable attraction burning between them. Forced to live under the same roof, share secrets, and protect each other in life-or-death situations, the line between duty and desire begins to blur. But when the case takes a deadly turn, and betrayal lurks around every corner, Kyle and Olivia must decide: will they risk everything for love, or will their dangerous world tear them apart before they even have a chance? Undercover Hearts is a pulse-pounding romantic thriller filled with suspense, passion, and two agents who must trust each other with their lives-and their hearts.