Explosive Attraction by Lena Diaz

Detective Rafe Morgan knew that, as a psychologist, Darby Steele was used to people coming to her in need. But now she was the one in danger. A serial killer had made her a pawn in a sick game by sending her photos of his targets with clocks counting down. As a part time bomb technician, Rafe was uniquely capable to keep Darby safe.

Getting to know the beautiful doctor had opened Rafe's eyes – and his heart. But if their elusive bomber had his way, Rafe would never get a chance to prove just how far he'd go to keep Darby alive.

Bodyguard Lockdown by Donna Young

Dr Sandra Haddad had created a serum that would change the world. In the right hands, it could heal the sick. In the wrong hands, kill millions. When she found herself in the crosshairs of a dangerous general with aspirations of world domination, she was given a bodyguard – Booker McKnight, the only man she'd ever loved and the last man she wants by her side.

Haunted by loss, McKnight knew that protecting the doctor meant flirting with disaster. Earning her trust would get them one step closer to completing this mission. But losing her again was unimaginable. The truth was that using her as bait was their only option…