Andrew “D-Day” Nolan came by his call sign naturally. With a great-grandfather and two uncles storming the Normandy Beaches, he has a proud ancestry. Due to a past that is full of heartache, especially with his family, he is wary of most people, women in general. At least, that was until he got tangled up with Sam “Buck” Buckard’s sister, Helen, against the stringent SEAL rule that sisters are off limits. He intends to avoid Helen, adding even more heartache since he’s been adopted by the whole Buckard clan after his frequent visits to Buck’s ranch in Wyoming. He’s going to miss that family and the ranch like hell. It had become more home to him than his own home. But when the team's ongoing mission sends them to the Philippines to prevent a terrible catastrophe, D-Day comes face-to-face with Helen who is working with a US medical group. In the past, he hasn’t been able to resist her, and he knows that given the opportunity, he’ll break his vow.

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Helen had no idea when she went home on leave from her job that she would run smack into Andrew “D-Day” Nolan while he was a guest at her family’s ranch. He had been reticent and distant until he wasn’t, and they had carried on a torrid affair right under her family’s noses. She had no idea there was any kind of SEAL rule about sisters, and to be honest, she didn’t much care. Still waters did run deep. Everything went to hell after Buck’s and Mari’s wedding reception, and now she had to deal with her unrequited love…until he shows up at her assignment in Manila. As a highly sought after trauma nurse, she was on a mission to help people in need. But little did she know how dangerous it was to be a pioneer in a country riddled with so many challenges. Criminals and terrorists only had one plan. Extortion, trafficking, and violence were at the top of their agenda. Helen soon discovers that D-Day’s big, strong arms and warrior attitude was all the security she needed.