Down to the Wire by Patricia Sargeant

Reunited by danger...and racing against the clock.

On the trail of a hacker, IT security expert Malachi Touré finds...a woman from his past he’s never gotten over. Dr Grace Blackwell is no hacker. She’s a medical researcher, and someone has stolen a potentially deadly formula from her computer. Despite the still simmering attraction between them, Mal is wary of trusting her again.Then everything changes when a killer has Grace in their sights...