Grady “Buck” McCormick blows shit up for a living as the explosives and demolitions expert on his SEAL team. He grew up on a thoroughbred farm in Kentucky, but he joined the Navy to escape the pain of watching his mom die a long, slow death of cancer. Since then he’s lived with the guilt and dedicated his life to protecting others, carefully guarding his heart along the way. Melinda Emerson loves chemistry but isn't so crazy about people. A pharmaceutical chemist with social anxiety, she’ll happily climb through a jungle canopy in search of medicinal plants, but put her in the middle of a party and she passes out. As the only child of older parents, she struggled watching her father fall victim to Alzheimer’s, and is determined to find a cure. Instead, she discovers a cognitive enhancer that has everyone from the CIA to the Russian mafia after her and her new invention. When Melinda's social anxiety spikes at a friend’s barbecue, she lands in Buck’s arms. After their one-night stand, Melinda makes a desperate call to Buck for help when her lab is attacked by Russian terrorists intent on kidnapping her and stealing her drug research. He blasts in guns-a-blazing, but under his watch, the relentless Russians manage to kidnap both of them, holding them hostage on board a container ship steaming toward the motherland. Now Buck must protect Melinda, her research, and his heart as he embarks on the mission of his life.

Dante “Chill” Winters is the medic on his SEAL team and has a reputation for staying cool under pressure. But when his brother dies and leaves his only daughter in Dante’s care, requiring him to leave the job he loves to move back to Chicago, it puts his chill to the test. December McKay is a cake decorator by day, and roller derby girl by night. She lives with her sister and her dog and loves her career and sport. Would it be nice to have love in her life? Sure. But she doesn’t need a man to be complete. That is, until a sexy paramedic responds when her van is t-boned as she’s delivering a wedding cake. Dante tries to settle into life as a paramedic and family man, supporting his grandmother and niece, but chafes at leaving his SEAL career behind. Then he meets a quirky cake decorator at the scene of an accident and suddenly civilian life looks a lot better. But when his brother’s crazy ex starts threatening him, his family, and his new girlfriend before the court can rule on permanent custody, Dante calls on his SEAL brothers for support, and Wiley “Coyote” Strickland, one of the new owners of Brothers in Arms protection service, comes to his aid. Now, along with a little help from his friends, Dante uses his military skill to protect those he loves and neutralize the threat once and for all before ultimately joining Brothers in Arms himself and becoming a protector for others in need.

Wiley “Coyote” Strickland is an ex-SEAL, but not by choice. A reckless motorcycle accident put an end to his career. Back home in Montana he’s completed rehab, but he’s full of self-loathing and has no direction. That’s when his VA therapist tells him about Hank Patterson and the Brotherhood Protectors. Wiley’s skeptical, but Hank has a job for him right away, so he figures it’s worth a shot. Agnes “Aggie” Dean is a hacker and cybersecurity expert. She’s hired to destroy a Russian cyber-terror cell, tracking it to the Crazy Mountains of Montana. Aggie’s a beast in cyberspace, but when her colleagues are kidnapped she discovers she’s out of her element in the real world. When she decides she needs help, the billionaire who hired her turns to Brotherhood Protectors. Wiley and Aggie hit it off in a big—and inconvenient—way, but Aggie’s eager to rescue her colleagues, and Wiley wants to prove to himself he still has value. The terrorists make an attempt on Aggie’s life, but Wiley saves her and takes her to his place to ride out an impending blizzard. Things heat up fast, despite the frigid weather outside. Once the storm blows itself out, the two have united into a formidable team determined to chase the terrorists from the industrial district into the mountains, and bring them down for good.