Island of Witches - Time Courier -spin off

The first spinoff of one of the most popular titles is here!
Our heroine opens her wardrobe just to find a famous author there. But the surprises don't end here. At the end of the day they are both accused of witchcraft in 1728. The broken Time Machine seems to be still working - but is still not doing its job properly. So even they can return to the present, they have to face some serious changes...
A gripping book even without having read the previous titles of the series.

Young adult. Novel.