Andy Gage, original owner of the body, is dead. The main character of this novel is Andrew, one of the souls that now inhabits the body and has control of it most of the time. His father is Aaron, another soul and the leader of the house in the body's head wherein countless other souls reside.
If this sounds confusing, then one of the best things I can say about this novel is that, by the time you get a few chapters in, Andrew's house, soul-hierarchy, and multiple personality disorder are entirely unremarkable facts.
Through the book, Andrew finds himself helping a woman named Mouse or Penny (or a few others), while two houses become less stable, one gets knocked down, and someone doesn't go to prison for murder.
'“Come on,” he says, taking her hand. “It’ll be fine.”
Mouse shakes her head: Oh no it won’t. Andrew, smiling—how does he stay so calm?—leans in close enough to whisper.
“Don’t be afraid,” he tells her. “We have him outnumbered.”'
-Andrew and Mouse