The store room of your house is locked with a certain kind of padlock that can be closed without a key but requires a key to open which you own and there is no duplicate key. You decide to move your old stuff to the storeroom. After keeping the things carefully, you lock it back again perfectly. The next day, a dead body is found in your closed store room.
Since only you have the key to the store room and you live alone, the police suspect you as the murderer. You can’t understand anything when suddenly a thought strikes your mind. There is a possible way using which the dead body could have been placed by someone else.
Can you find that way so that you can tell the police and prove yourself to be innocent?
When you were inside the room, the murderer replaced the padlock with his own one that was identical to your original padlock. When you locked the store room, you did not require a key and there was nothing abnormal for you.
When you left, the murderer opened the padlock with his key, placed the dead body inside and replaced his padlock with the original padlock back in place. He then locked it without any problem.