"In a near-future world where tree pollen has made outdoor air unbreathable, a woman's safe but tedious life is thrown into turmoil when she witnesses a murder and her young daughter starts sleep-talking about the killer"-- Provided by publisher.

The climate apocalypse has come and gone, and in the end it wasn't the temperature climbing or the waters rising. It was the trees. The world became overgrown, creating enough pollen to render the air unbreathable. In the decade since the event known as the Turning, humanity has rebuilt, and Izabel has gotten used to the airtight domes that now contain her life. She raises her young daughter, Cami, and attempts to make peace with her mother's death. She tries hard to be satisfied with this safe, prosperous new world, but instead she just feels stuck. And then the peace of her town is shattered. Someone starts slashing through the domes at night, exposing people to the deadly pollen--a serial killer. Almost simultaneously, Cami begins sleep-talking, having whole conversations about the murders that she doesn't remember after she wakes. Izabel becomes fixated on the killer, on both tracking him down and understanding him. What could compel someone to take so many lives after years dedicated to sheer survival, with humanity finally flourishing again?