Rogue Agent by Louise Rose-Innes

Dom is deep undercover. So deep he can’t even let his unit know he’s alive. But the SAS Rogue Unit manages to track him down and asks him to use his cover to help them hunt down British fugitive, Alex Marku. To get close to Marku, Dom seduces the arms dealer’s beautiful, young assistant, Becca.
Becca’s life is a train wreck. Why is she always attracted to the wrong kind of men? And how did she end up working for the biggest crook in South America? Then she meets the charismatic bad-boy mercenary, Dom, who sets her pulse racing, but when he starts working for her boss, she knows things are about to go from bad to worse…