Evidence in an NCIS murder case reveals a rare painting on loan has been swapped for a fake, prompting DiNozzo Sr to share his knowledge and contacts of the black market art world with the team.
The team suspects that a man who made his money by donating sperm, was killed by a recipient who learned his records were inaccurate. Meanwhile, Brennan enters a feud with a fellow author.
When Stephanie and Charlie learn that Gabby has had a secret boyfriend, they meet him, finding him to be a bad influence.
After being recruited by a professional video gaming team, James learns that it is not what he thought it would be.
When the children abandon her on Halloween, Stephanie feels unnecessary; Charlie tries to keep the best house in the neighbourhood.