How The Good Nurse stars got in their characters' heads - featurette

In the new video Jessica Chastain (Amy Loughren) and Eddie Redmayne (Charlie Cullen)

share how they transformed into their characters and brought the true story to the screen.

"The thing about playing Charlie is that he's a sociopath and he conned the world.

The physical element was important to me in trying to get inside Charlie's head,

he would self-soothe a lot whether that was, you know, touching himself or

touching his hair or his clothes" - Eddie Redmayne on playing Charles Cullen

Director Tobías Lindholm: "What he's able to do physically

to transform I've never seen before.

Jessica Chastain: "It was his eyes has shifted and he had become

someone else, and literally the second it was cut, he was just like

back to being the wonderful person".