BR1: Dog in school

I read a book whose title is "Dog in school" This story is a dog whose name is Mystery romped around Sam's school. Sam is a girl and Mystery first met her. He followed her and her friends. He entered their school and interfered with their studying, so their teacher, Mr. Hapkins and his students went outside to catch Mystery. However he fled from place to place into their school.
Final, he was caught and his owner was known by his collar. Sam and her teacher, Mrs. Turner went to the home of Mystery's owner to take him back. Sam and Mrs. Turner knew Mystery's real name then. His real name is also "Mystery"! His name is really trouble!! I was burst into laughter by the punch line. (128 words/1674 words)