In Tobias Lindholm’s “The Good Nurse,” the sharply-refined lead performances from Eddie Redmayne and Jessica Chastain are so strong that they make viewers forget about a screenplay that doesn’t always live up to their work.

Written by Krysty Wilson-Cairns (“1917,” “Last Night in Soho”) and based on the book by Charles Graeber, the film focuses on the crimes of Charles Cullen, a nurse who, over the