While on the flight back from Paris, Tony and Ziva realize that their assignment to protect a government witness in an embezzlement case is in great danger when they learn that an assassin is located on the same flight.
It's Frank's 50th and Liam has the dubious honour of sharing the auspicious day with him on his 11th birthday. Uncharacteristically, Frank snubs the chance of a party, and instead opts to dwell in his own lonely loveless existence until... Libby, a local librarian falls into his life.
The Maguire clan is fully mobilised for the christening of its newest member baby Connor, with Mimi pulling all the strings. Her first act, reallocating godmother duties, leaves now 'ex' godmother Kelly devastated.
This week starts off with a high-stakes pop challenge in which contestants race for the prize of immunity - and the winning team also gets three envelopes to give to the teams of their choice with instructions that could have a dramatic impact at this week's weigh in. Also, tensions are high between the trainers and one team suspected of game play, and a lifting competition rewards the winning team with a prize that everyone wants.