After an experimental drug trial goes awry, the test subjects face a terrifying side effect: if you fall asleep you die. Trapped in an isolated facility, panic ensues as they try to escape and somehow stay awake.

When Lorna Brady, a survivor of one of Ireland's Magdalene Laundries, wakes to find a corpse in her house, she has no idea who the dead woman is or if she's responsible for the apparent murder, because she has long suffered from extreme bouts of sleepwalking.

DI Colette Cunningham's no nonsense approach to policing has earned her the respect of her Merseyside Police colleagues. She seems unflappable, until she gets a call from the Garda in Dublin after the body of a young woman is discovered.

When Keira Woods' daughter mysteriously vanishes in the cellar of their new house in the country, she soon discovers there is an ancient and powerful entity controlling their home that she will have to face or risk losing her family's souls forever.

The psychologist Cathrin Blake actually wants to withdraw from her work for the police. After a mysterious murder during the ghost parade of the "Samhain" harvest festival, however, Superintendent Kelly asks for her support. It's not just about the bloody act, but also about the disappearance of Holly Reid, the victim's friend.