In the Enemy's Arms (Harlequin Romantic Suspense Series #1712)

It was supposed to be a routine trip to Cozumel to provide medical care for the orphaned girls of La Casa. But instead of the bustling joy of a full house, Dr. Cate Calloway finds silence, threats—and danger. And the only person she can turn to for help is the last man she wants to see.

The spoiled playboy buddy of her ex-husband, Justin Seavers has never been a man Cate could rely on. But now he's her only hope to rescue their friends who run La Casa. As the two set off on an international adventure, the former enemies are thrown together and quickly find out that looks can be deceiving…and passion can't be denied for long.