8.30pm tuesday / SEPTEMBER 2

A dead body is discovered on a building site, but is the person a victim of an accident or a killer? Ducky and his assistant Jimmy Palmer investigate the body, on site, in order to determine the sequence of events leading to their death. However, when Palmer comes face-to-face with the suspected killer, he realises he may be the next target.

The dead body is identified as a man called Baxter – but investigations into his personal life reveal that he has no bank accounts, no tax records and no permanent residence. How could a man exist with so little link to reality?

Palmer, meanwhile, has very little recollection of the killer, despite intensive interrogation, so Abby and McGee are forced to use alternative methods to try and jog his memory. He may just reveal a little more than he intends to when Abby puts him in under hypnosis.

Gibbs and the team return to the building site to reinvestigate and make a gruesome discovery of a body, mummified in a concrete pillar. Evidence suggests that Baxter was doing some killing of his own, before his own demise. Could this be linked to his own death? And how can Gibbs protect Palmer if they can't identify who the killer is?