This is the third book in the series. Matt, Ben, Nicky and Kris are four friends living in the small town of Coolongawong in New South Wales. They have just finished primary school and spent the last two years in Mr Mac’s class. They discovered at the beginning of Year 5 that Mr Mac’s classroom was a magic one and by tripping on a creaky floorboard, crashing into the teacher’s desk and saying the magic words History’s a Mystery, they could be transported back in time and discover history as it is being made in exciting, and sometimes dangerous, adventures.
Now they must leave the magic classroom behind as they begin high school in Orange. However, Mr Mac has given them hope that their magic adventures may continue. Together they visit Scotland and Sydney before realizing that their adventures cannot continue.
Matt decides to invite his younger sister Olivia along on an adventure to the Klondike Gold Rush in Alaska. This, in turn, leads to her including her friends Grace, Will and Jack. Together, these four discover the wonders of Mr Mac’s magic classroom and visit many new places together including the Warsaw Ghetto, China’s Terracotta Army, the airship Hindenburg, the Incas, the Taj Mahal and Stonehenge, with many other places in between.
Mr Mac’s love of teaching history provides some of the destinations the four friends choose to visit. Others are the choice of the children. In this third book in the series, they continue to meet some of history’s most famous heroes, and are present at some of history’s most crucial times.