Matt, Ben and Nicky grew up together in the small town of Coolongewong. Now they are about to start 5th class with the school’s most popular teacher, Mr Mac. On the first day of school, a troubled new girl, Kris, joins their class. Kris can’t forgive her mother for bringing her to this small town out the back of woop-woop and is determined to hate her new school. But all that is quickly forgotten when, together with her three new friends, they discover that they can go on the most amazing adventures within their own classroom.

In this sequel, Matt, Ben, Nicky and Kris begin Year 6 in the small town of Coolongawong. Again they have Mr Mac as their teacher in the magic classroom so their adventures can continue. By tripping on a creaky floorboard, crashing into the teacher’s desk and saying the magic words History’s a Mystery, they found that they can be transported back in time and experience exciting and sometimes dangerous adventures.