A Marine falls off a cliff, and his camera records him falling to his death. The prime suspects are his wife and his best friend with whom he was staying in the camp. Gibbs finds out they had an affair behind a dead man's back and he tries to persuade them to blame each other. In the meantime, Abby with McGee's help reconstructs the damaged film footage on the camera and reveals a previously dismissed suspect to have been in the vicinity at the time of the death.