Harbored by the SEAL

Navy SEAL playboy Leo "Cowboy" Wilson has done his best to stay away from Charlotte O'Malley, the sister of his HERO Force teammate, Logan. But when Charlotte books herself on a week-long cruise knowing Cowboy's there on HERO Force business, she’ll get more than the fling she bargained for, with a terrorist cell placing Cowboy and Charlotte firmly in the path of danger.

This is a novella. It's more than half the length of a full HERO Force book.