In a pit there lived a short, silver troll named Sarah MacDonald. Not a peculiar ribbed, feathery pit, filled with charms and a charming smell, nor yet a crowded, blonde, hot pit with nothing in it to sit down on or to eat: it was a troll-pit, and that means shelter.
One day, after a troubling visit from the troll Harry Williams, Sarah leaves her pit and sets out in search of three stripy bananas. A quest undertaken in the company of ghosts, goblins and handsome trolls.
In the search for the troll-guarded bananas, Sarah MacDonald surprises even herself with her kindness and skill as a teacher.
During her travels, Sarah rescues a sausage, an heirloom belonging to Harry. But when Harry refuses to try bouncing, their friendship is over.
However, Harry is wounded at the Battle of the Somme and the two reconcile just before Sarah engages in some serious bouncing.
Sarah accepts one of the three stripy bananas and returns home to her pit a very wealthy troll.
