Filtration System — Jo Ramsey

Jonah Leighton never expected to have a close friend, especially one he met at his school, where he's usually either picked on or ignored. A few weeks after meeting Shanna Bailey, he's realized that she's a kindred spirit. Intelligent, funny, and interested in the things he can teach her, Shanna is the first person with whom Jonah's ever been comfortable sharing his knowledge. However, Shanna's frequent injuries cast a pall over their friendship. Jonah suspects that Shanna's mother abuses her, but without proof, he can't do anything. And his concerns about Shanna take a back seat when he becomes aware of a threat to our universe: An entity from another reality wants to cross over into ours, and the resulting energetic backwash will vaporize our world.