Nothing has been the same for Alexa Baxter since she tried to save Una, the Bright One. Her friends don't remember what happened on their cross-country adventure. Sid doesn't care, but Mateo is desperate for answers. And worse, she's developed a new ability since the Brume and Una broke into her mind. Strange text messages begin to appear on her phone and Alexa has the feeling the multiverse isn't done with her yet.

Alexa never expected to stumble across a unicorn trapped in the women's bathroom, especially not one on the run from a monster. Totally freaked out but unable to leave the magical beast behind, Alexa offers the unicorn, Una, a refuge in her parent's backyard shed until they figure out what to do next. When the monster, a beast made of cloud and rage, shows up on her doorstep, Alexa and Una have no choice but to run for their lives. Alexa recruits the aid of her best friend, Mateo, and her unrequited crush, Sid, to help her save Una. Together they pile into Alexa's Honda Civic and begin a race across the American Midwest. But the monster is clever as it is quick, attacking both from above and below, as well as within. As their deadly game of cat and mouse unspools, the monster focuses its attention on Alexa, claiming Una is not what it seems. Despite her inner turmoil, she must find the strength to fight for the ones she loves and figure out who is...