English summary of the text ”The Empty School”

The story is about a girl (who we don´t know the name of) and her two friends Martin and Meg who is twins. And this day was a little different, the teachers gave them half an 

hour´s extra free time in the dinner hour. So the three of them was hanging out in the sun when Martin went to get his jacket and came out without it and said that the teachers was gone. They didn´t believe in Martin so they went to look. And he was right, everyone was gone. So they starting to look in the classrooms and in the staff room but they didn´t find anyone...And than...