Since the trial-by-fire incident that made them choose life outside the navy, David Williams and Hunter Masters, formerly the captain and the lieutenant of the nuclear submarine Cascade, have been together for a year and a half. And for four of those months they have been a devoted married couple. Then one day a mysterious love letter arrives in their mailbox, addressed to Hunter from a woman named Megan. Though David finds it hard to believe that his husband would have an affair, let alone with a woman, the letter sparks a whole different kind of fire between the two men who have been in love practically since the day they met. Setting aside their mistrust and disbelief, they set out together to find out who is behind this mysterious note, and what is the full story of forbidden love hidden under the roses.