It was also known as La morte viene del passato (Death Comes From the Past) in Spanish markets.

[1][2] Four men, on the seashores of a small island, kill Charlie, one half of a young couple who were having sex on the beach, by shooting him and then being buried alive under the sand.

The murderer, in fact, had staged her death immediately after landing on the island: she is Charlie's daughter who intends to avenge her father killed years ago by Ubaldo, Lorenzo, Michele and Walter.

She faked her drowning, delighted to have seen the whole family squirm from that point onward while she avenged her dead father.

When Lorenzo tries to start the propeller, the boat bursts into flames, immolating him instantaneously, as the wounded Carla watches from the rocks.