Based on the Flannan Isle mystery. A small relief boat approaches a tiny, isolated island where a lighthouse is located. They're to replenish the stocks and replace the crew of 3. After they dock no one greets them. The winch is broken. The lamps are clean and refilled; the table's laid for dinner. There's an upturned chair, 2 sets of yellow oilskins are missing - the 3 men have vanished.