8.30pm thursday / JULY 31

Lost treasure, black mail, backstabbing and murder - the CI team have a lot on their hands this week.

Treasure Hunter Rick Agiza is murdered in the midst of a scuba dive and further investigation reveals Rick was on the hunt for some lost treasure. Rick’s girlfriend Dana is very concerned when Rick doesn’t return from his dive - but what part does she play in his disappearance? She is, after all having an affair with their business partner, Dan “Chilly” Chilton.

But when both Dana and Chilly go missing, the team have to address there may be a fourth party behind the murder. Could the missing treasure provide the answers they need?