With twelve years in the Coast Guard under her belt, Lieutenant Caroline Dunn is eager to conduct the sea phase of the top secret all-terrain assault code named Pegasus. Unfortunately, that phase includes working side by side with a certain hard headed representative of the U.S. Marine Corps. Major Russ "Mac" MacIver is six-two of superb muscle and absolute dedication to their mission, but his stubborn, by-the-book views ruffle even Cari's usually unflappable calm.

Then their test program goes real world, real fast, and they take Pegasus into a remote Caribbean island to extract US troops under fire. When they also rescue stranded missionaries and their young charges, Cari sees a whole new side of Mac — one that stirs a passion that shocks her and convinces him there's more to life than rules and regulations.