By Honor Bound: Harlequin comics

Jenna has always followed her army colonel father and now she lives in a battlefield in Spain with four other officers. All four officers are like family to her, but she is particulary fond of the eldest, Major Garrett. One day, her father is killed in combat! Now Jenna has no choice but to move out of Spain and live with her relative in England. One of the officers suggests that Jenna should marry one of them so that she can stay with them. While Jenna is startled by the officers' proposal...