When chemistry teacher Brooke Jensen moves to a quiet suburb, she notices her elderly neighbor's garden growing at an impossible rate and pets mysteriously disappearing—including her own dog. After a confrontation leaves her wounded, Brooke discovers something unnatural growing from the scratches on her arm. As bizarre plants spread through the neighborhood, she must use her scientific background to uncover an ancient threat while battling her own accelerating infection. With time running out and facing betrayal from those closest to her, Brooke confronts an alien intelligence that may forever alter the fate of their small town.