Claire Conrad 
Destiny: Timewalkers: 1 [EPUB ebook] 

Desire… Deception… and one woman’s Destiny…
Alexa doesn’t want the “gift” that makes her able to travel back through time, but should she refuse, seven billion people will die from a horrible bio-agent known in her time as the Red Death.
Alexa’s duty is to stop the Red Death by any means necessary, even if she must destroy its creator, Luke Lawson. However, once she meets Luke, her mission becomes clouded. The viral cultures are missing, Luke’s superiors are keeping deadly secrets, desire burns like wildfire in their blood, and the clock is ticking.
Will Alexa be forced to destroy the man she’s come to love?