The Bodyguard and the Heir, #1

Leaving the military for a less dangerous job as a bodyguard was all Nathan Mason was looking for. Tough and sometimes arrogant, Nathan soon realized he was in over his head. Hired by powerful Arthur Madison, a giant in the pharmaceutical industry, he was placed in charge of the highest of Arthur's greatest asset: protecting Arthur's only son, Christian, the heir to the Madison fortune.
An attack on the heir's mansion soon puts his life and Christian's in jeopardy. Now Nathan must put all his training and skills to the test in order to save the heir. Even though Nathan is capable and prepared, it's his emotions and the affections he feels for the young man that are certain to get him killed.
He must put aside these very feelings, if he's to save Christian, the one who's stolen his heart.