At Delmenhorst Hospital, Germany, administrators notice death rates in their intensive care unit have risen sharply. Suspicions fall on Nurse Niels Hogel who turns out to be Germany's most prolific murderer since the Second World War.

When a resident dies at a care home in Albany, Western Australia, it's assumed she passed away peacefully. But an autopsy reveals horrific injuries.

When an elderly care home resident is discovered dead, a murder investigation begins into a nurse at the home, who later becomes a victim of violent attacks.