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Forensic scientists use modern methods to point to a previously undiscovered suspect.

The eleven remaining contestants are divided into three teams. One team is sent to three locations along the headland near Middle Head with the job of visually communicating clues to another team in a speedboat on Sydney Harbour, while the final team have to decipher the clues that the team in the speedboat have written. They then travel to Melbourne, where their abilities to communicate are again put to the test when they are divided into two teams guided by a navigator, and each have to search buildings in the city for clues that will lead them to Shura's location. A surprise awaits the contestants when they have to sit another quiz, resulting in the contestant who receives the lowest score becoming the second to be terminated.

The ten remaining contestants have to search the iconic bathing boxes on Brighton Beach for some treasure. A psychologically intense game of trust played in the State Library of Victoria exposes and destroys some allegiances, with some people playing for the group, others playing for their alliances and still others playing for themselves.