Shoestring - Season 1 Episode 4 An Uncertain Circle

Marion Cutler, a social worker, asks Eddie to look for Nick Forrest, one of her charges who has gone missing. Nick is a remarkable fellow who had been living in a hut on the beach. But Steve, the owner of the hut, tells Eddie he's never heard of him. The mystery begins to centre on some aerial photographs of the coast-line taken by Nick, and Eddie soon finds he is onto a dangerous gang of drug-smugglers.