The Visitor is book 3 in the series and following the traumatic events in London, Mike Wesley and Rebecca Hollister have moved back to Ireland in the hopes of saving their weakening relationship. Mike has taken on a new role heading up a special investigation unit in Pearse Street Garda Station alongside his former colleague, Gregory Walsh. All is going well until a body shows up that puts Mike, Rebecca and Gregory on a collision course with a new breed of sadistic killer. No one is safe.