Hearts Still Beating by Brooke Archer

Seventeen-year-old Mara is dead—mostly. Infected with a virus that brought the dead back to life and the world to its knees, she wakes up in a facility to learn a treatment for the disease has been found. No longer a Tick, Mara is placed in an experimental resettlement program. But her recovery is complicated by her destination: she’s sent to live with the best friend she hasn’t seen since the world ended—and since their first and only kiss.

Seventeen-year-old Rory is alive—barely. With impaired mobility from an injury and a dead sister, Rory’s nightmares are just as monstrous as the Ticks that turned her former best friend. Even after the Island—one of a handful of surviving communities—rebuilds itself, Rory is prepared for the Ticks to return at any time. She never expected them to come in the form of the only girl she’s ever loved.

As the girls struggle with their pasts and the people they’ve become, and with the Island’s fragile peace in the balance, Rory and Mara must lean on each other to survive—or risk losing the girl they love all over again.