NCIS is kicking its November episodes off with a sleuthy tale!

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In the seventh episode of the season, which is called 16 Years, Dr. Donald "Ducky" Mallard (David McCallum) will bring the NCIS team into a secret society he is a part of that solves cold cases.

The press release revealed that the team would investigate the murder case of a retired Navy Lieutenant Commander, which will lead to Ducky admitting his involvement in this secret society he is involved with since the deceased was also a member of the society.

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Actress Jessica Walter will guest star as society member Judith McKnight and actor Richard Riehle will guest star as fellow society member Walt Osorio.

The NCIS YouTube channel shared a preview of the episode, which is below, that shows Gibbs (Mark Harmon) and Eleanor "Ellie" Bishop (Emily Wickersham) accompanying Ducky to the secret society's meeting place, in which they get to hear the secret knock to get inside.

The two NCIS agents will then meet Walter's character.

"You have a very commanding voice and big hands," Judith McKnight tells Gibbs, which leaves Bishop slightly perplexed as an "Oh boy!" leaves her mouth.

Riehle's character will meet the agents too and explain the secret society to them.

"We are the Sherlock Consortium," Walt Osorio explains.

"Amateur detectives," Gibbs follows with.

The plot thickens in this episode since Abby (Pauley Perrette) will be hard on herself since a test she conducted that was flawed has sent innocent people to jail.

"Innocent people went to jail," Abby tells Gibbs in her lab, which he adds to by saying, "Because of a flawed test."

"A test that I conducted," she concludes.

Abby is counting on Gibbs to fix the situation they're in.

"You always fix things," she tells him, adding, "Please fix this too," before hugging him.

NCIS airs on Tuesdays on CBS at 8 p.m. ET.

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NCIS, Television, CBS