A double bill of real-life serial killer dramas. In 'Gacy' John Wayne Gacy was a model citizen who even volunteered as a clown for the children at the local hospital. However, he kept a gruesome secret and a trail of missing young men led the police to Gacy's suburban Chicago home. The nation watched in horror as, one by one, the details of over 30 murders came to light and most of the victims, entombed under the house he and his family lived in, were unearthed. Whilst in Dahmer' Jeffrey Lionel Dahmer (Jeremy Renner) was vilified when authorities discovered he'd murdered, dismembered and even tried to consume the bodies of 17 young men in Milwaukee, Wisconsin. But is there such a thing as a human monster?