Once upon a time, there was a boy named Christopher who loved solving mysteries. One night, he found a dog lying on the ground with a fork sticking out of its side. Christopher wanted to find out who did this to the poor dog.

He talked to his neighbors and looked for clues, but no one would tell him anything. Christopher was determined to find the mystery. He found a note in his father's room that said "I did it" with no explanation. Christopher was confused and scared, but he still wanted to find the truth.

He worked hard to find out what happened to the dog. He talked to his teacher and wrote a book about the mystery. In the end, Christopher found out that his father had killed the dog because it was sick and suffering. Christopher was sad, but he understood why his father did it.

Christopher's book was a big success and he was able to help others understand what had happened. He learned that sometimes the truth is hard to accept, but it is important to never give up on finding it.