The Second Generation Time Mishap

What happens when a group of 25 children get a hold of a time turner and get blasted to the past, to the summer before Harry and his friends 5th year at Hogwarts. For my story to work Draco Malfoy switched sides in his 6th year and became a spy for the Order but Dumbledore still died as it was part of his plan to defeat Voldemort. Disclaimer: JK Rowling owns Harry Potter, not me :)