Betty's mysterious illness and recovery

Elspeth Kerr was a beloved local nurse in 1930s Devonport, but when her husband died suddenly and her foster daughter fell into an inexplicable coma, locals discovered the shocking truth: Nurse Kerr was a serial poisoner. But more than 90 years later, elements of her crimes remain a mystery. In the first of a two part episode, Black Sheep investigates the chilling story.

The Trials of Nurse Kerr: The anatomy of a secret poisoner by Scott Bainbridge

Go to this episode on rnz.co.nz for more details