Point of No Return by Susan May Warren
An American boy and a warlord's engaged daughter have disappeared-together-in an Eastern European border country. Only one man can find them in time to prevent an international meltdown-Chet Stryker. But Chet is taken aback when he realizes the boy is the nephew of Mae Lund, Chet's former flame. When Mae insists on rescuing her relative herself, Chet knows he has to protect her from the enemy on their trail. Yet can he protect himself from falling for Mae again?