Katie Sigismund

A NYPD whistle-blower claims there's been abuse of power within the organization, so Frank must investigate whether this is true. Meanwhile, Danny and Baez are suspicious of a car accident involving a pedestrian and think it may have been intentional.

Eccentric Sherlock Holmes solves crime in present-day New York with his companion, Dr. Joan Watson.

Nell goes under cover as replacement for a dead Defense Department researcher; the new NCIS assistant director questions Hetty's leadership.

When a high school principal is shot while trying to turn his school around in the midst of a scandal, Brenda and her detectives soon realize their case overlaps with an existing FBI investigation. The situation leaves Fritz and Brenda sparring over whose murder case it should be.

When Allison gets a skin graft on her hand after it is burned, she wonders why the hand acts with a mind of its own; Bridgette keeps her role on the soccer team a secret from her parents.

An NYPD officer kills a troubled fellow officer who took hostages at gunpoint; detectives Lupo and Bernard find valuable stolen documents and a dead body at the man's apartment.