Sometimes, the world is too much for Mona Starr. She's sweet, geeky, and creative, but it's hard for her to make friends and connect with other people, and her depression seems to take on a vivid, concrete form. She calls it her Matter. The Matter seems to be everywhere, telling Mona she's not good enough and that everyone around her wishes she'd go away. But with therapy, art, writing, and the persistence of a few good friends, Mona starts to understand her Matter and how she can turn her fears into strengths.