Reclaim by Amabel Daniels

Reunited with one of the Project’s original researchers held captive at a cartel compound, Cassidy is tasked with delivering answers about a so-called miracle drug. She struggles with the fear of being separated from Luke, anticipating he’ll be harmed unless she cooperates. The details the cartel wants aren’t forthcoming, and instead, she’s instructed to find another Project colleague in another city.
Luke doesn’t sit still once he’s parted from Cassidy. The danger in this jungle is unlike any peril he faced in prison or on the streets, but using his head—and ignoring the ache in his heart at losing what he’s sure is love—he plans an escape. Once they’re on their way, however, he still lacks the chance to tell Cassidy how much she means to him.
They leave behind death and horror to find a scientist in the city. Wrought with doubt and confronted with hostility, they realize they have the key pieces to ending Project Xol. Faced with the responsibility of destroying the resources that could save many lives, decisions are harder to make. And when it becomes clear Cassidy is expected to be reunited with her family, the stakes are higher than ever.