Thornberry — Susan Dean

What happens when an ordinary morning spent mushroom-picking suddenly turns into a magical experience like no other you could ever imagine experiencing? Hannah finds this happening to her and a fantastic adventure begins which is sometimes fun and at other times terrifying, where she will meet new and unusual friends, and ultimately for them all, a decision must be made on whether to finally turn back to face a dangerous journey full of uncertainties or go on into a new and totally unknown world.