Crossing Lines by Adrienne Giordano

While protecting a dangerously attractive ex-agent, a former CIA operative must decide which asset is more important to him: his identity or his heart.

She’s running out of friends—and out of time.
CIA operative Elizabeth Aiken is on her own. After a rescue operation in Venezuela goes south and her cover is blown, Elizabeth barely escapes the country with her life. Set adrift by the Agency and with a price on her head, she seeks out the only person who can help her disappear.

Viper.

Unfortunately, the devastatingly attractive former operative wants nothing to do with her or the cartel-backed Venezuelan president who wants her dead. Worse still, if Elizabeth’s not careful, she’ll end up losing her heart instead of watching her back…and there’s no room for mistakes with assassins hot on her trail.