There's a room with a table in the middle of it. On the table, there is a deck of cards. Four chairs surround the table and all are empty but one, which has the body of a dead man in it. The room is illuminated by a flashing red light and there are three hooks on the wall. The man was not killed and he was alone when he died. Explain:
An air lock in a spaceship.
There were 3 spacesuits (hence 3 hooks) and 4 men. They played cards for the suits and he man who ended up dead lost.
The flashing light signalled a loss of air so the other 3 donned the suits and left the 4th man behind and he died of lack of oxygen.