Part of the Ai to Meiyou no Tame ni series (愛と名誉のためにシリーズ), also called the "Love and Glory" series, which goes as follows:

1. Kono Ai wa Kizutsukanai
2. Tsubasa o Oranaide
3. Eikyuu no Kikan
4. Kono Yoru ga Aketara

Orders were orders, but battle-weary undercover agent Kit Anderson chafed at seeking refuge from death threats in the house of her new boss, Coast Guard Lieutenant Noah Trayhern. Noah's cold authority masked inner demons that rivaled her own; his rough kindness sliced through her careful defenses. Suddenly her safe house was under siege—from the inside!—and Kit's heart was in danger...