As an experienced nurse with all the right credentials, the killer moves nearly undetected through patient rooms and medicine dispensaries to murder in plain sight.

source:sENSACINE

Jessica Chastain as Amy Loughren in "The Good Nurse." The New Jersey nurse helped police stop serial killer Charles Cullen

source:NETFLIX

her colleague at Somerset Medical Center who killed 13 patients there and more people in his 16 years as a nurse. Silence from hospitals enabled his murders.

source:NETFLIX

But the focus of “The Good Nurse,” the Netflix movie based on the true story of his grisly career as a hospital-sanctioned murderer, is not about the making of Charles Cullen.

source:NETFLIX

The film, now in select theaters and premiering Oct. 26 on Netflix, is about the health care system that enabled him to become possibly the most prolific serial killer in history.

source:NETFLIX

Jessica Chastain as Amy in "The Good Nurse" with Devyn McDowell and Alix West Lefler, who play her daughters Maya and Alex

source:NETFLIX

Jessica Chastain as Amy in "The Good Nurse" with Devyn McDowell and Alix West Lefler, who play her daughters Maya and Alex

source:NETFLIX

Noah Emmerich, left, and Nnamdi Asomugha play New Jersey detectives Tim Braun and Danny Baldwin, who worked with Amy Loughren to investigate Charles Cullen

source:NETFLIX

“The Good Nurse” may present as a high-concept take on a true crime story, but it is a horror film — one that doesn’t let us feel better because the killer has been caught.

source:NETFLIX