On his fourth voyage, Sindbad and his shipmates are again shipwrecked. They are captured by cannibals who feed them a strange plant which makes them unable to think
of anything but food. Sindbad realises the cannibals want to fatten the men so they can eat them so he avoids eating the plant. He is able to escape and is befriended by people who take him to their island. On the island he marries a beautiful woman, but when his wife dies the people of the island, according to their custom, drop him into a cavern with his dead wife. He finds many diamonds in the cavern and manages to escape by following an animal. Soon he is back in Baghdad, richer than ever