The Jefferson team is set to unlock a mystery to protect one of their members in "Bones" season 11 episode 20. Also, Cam's sister is set to appear in the episode.

"Bones" season 11 episode 20 is entitled "The Stiff in the Cliff." According to Spoilers Guide, the episode is set to see the group to know the truth behind a killing act and this would help protect one of their team members.

As per the publication, the remains of iconic billionaire explorer Henry Charles are seen in Antartica and the case, which is a high profile is taken to Booth and Bennan to double check if he was killed or not. It is further revealed that the team affirms that the character was murdered, as evidenced by being missing a decade ago while on voyage.

In line with Charles' death, Dr. Clark Edison is treated as a suspect, since he was with Charles during the expedition.

Along with the investigation of Charles' death, "The Stiff in the Cliff" is also set to see the arrival of Cam's sister in the town. According to Hall of Fame Magazine, Cam is set to handle the situation and she is assumed that she will be able to help resolve the matter, as she is the Jeffersonian Institute Forsensic Division head.

As per reports, Cam's sister is also set to continue with the wedding plans; however, things are set to be influenced by previous conflicts in the family.

"Bones" season 11 episode 20, "The Stiff in the Cliff," is set to air on June 23.