on monday jack stand up in the morning, he will travel to the school,but,one high smell, to the next room call the atencion for the jack, what is the smell? asked jack.

when jack opened the room, he met with a grim picture, his neighbor, old woman was dead.

jack called the police, when they arrived, their first thought was that jack is the prinsipal suspect.

the forensic, reported that the woman´s death had been caused by a powerful poison, the police started the investigation, they examined the woman´s room, searching the clues, but, the only clue was a footprint left on the floor of the room
the footprint did not match with jack´s shoes nor with the woman´s shoes.

when they are searching in the woman´s room, found, missing the valuable items, the murder was a robbery, the tief had poisoned yhe woman, fled with the trasure.

the police, searshed the rest of the building, almos did not find any thing, but just then, forensic expert called to give the result of type of poison to kill woman

the same poison, was found in the apartament of a man, to check their shoes matched the footprint in the room

case solved!!!