A team comes to the island looking for the fabled treasure of the pirate Leclerc. Group leader Daniel Morgan is injured in an explosion and another member Ian parks shot dead in Daniel's tent. Poole believes Daniel was the intended victim,especially when he survives another 'accident'. However,learning that Parks seemingly found the treasure and marked it with grid reference PD46 on a map Poole wonders if Daniel killed him and faking the attempts on his life. He changes that view after Daniel is murdered but finds the motive for the double slayings had nothing to do with treasure but that PD 46 was another commodity worth killing for.