Ducky's links with a secret society will be explored in episode 7, new spoilers for "NCIS" season 13 revealed.

In the next episode, Dr. Mallard will introduce the team to another super secret group that he's involved in that's actually trying to revisit cases believed to be impossible to crack.

Cartermatt noted that fans will have to wait for the story to come back to Gibbs' mental and physical state later in the season.

"Fittingly, we will see a little more about that later this season, though there will be some other great stories introduced soon to go along with it," it said. "This is a show that likes to juggle a wide array of different things at the same time, and it's with that in mind that we think this this is a pattern that will continue."

The synopsis teased spoilers for "NCIS" season 13, episode 7 as it reads, "The NCIS murder case of a retired Navy Lieutenant Commander forces Ducky to reveal his participation in a secret society that solves cold cases.

The guest stars for this particular episode include Jessica Walter guest stars as Judith McKnight and Richard Riehle as Walt Osorio, who will play prominent members of the secret society.

In the preview clip spoilers for "NCIS" season 13, episode 7 were revealed as Walt Osorio tells Agent Gibbs that they are the "Sherlock consortium," but the latter is not impressed as he corrects that the secret society is composed of members who are "amateur detectives."

NCIS" season 13 stars Mark Harmon as NCIS Special Agent Leroy Jethro Gibbs, Michael Weatherly as NCIS Special Agent Anthony "Tony" DiNozzo, David McCallum as Dr. Donald "Ducky" Mallard, Pauley Perrette as Abby Sciuto, Sean Murray as NCIS Special Agent Timothy McGee, Rocky Carroll as NCIS Director Leon Vance, Brian Dietzen as Jimmy Palmer and Emily Wickersham as Probationary NCIS Agent Eleanor "Ellie" Bishop.

"NCIS" season 13, episode 7 airs on Tuesday, Nov. 3, on CBS Television Network.