The book's plot is set in the near future at a time when cloning has been legalised in the U.S. It is based around a Chicago-based cloning doctor, DavisMoore, whose daughter is brutally raped and killed. The doctor uses the murderer's DNA to clone him. The resulting clone is a boy called JustinFinn, whom Moore follows throughout his life, hoping the boy will offer a glimpse into the killer's psyche and perhaps enable Moore to find the identity of his daughter's murderer.