https://www.enidblytonsociety.co.uk/boo ... of+Fairies" onclick="window.open(this.href);return false;
You can read the short story for a limited time here:The Tenth Task is a story of Zani, the wicked spirit and the way it's worded gives the impression that there were nine earlier chapters with tasks from 1 to 9. There's a boy called Jack in this tale and he's going to enter a door that he found in the hillside but he has to wait until Thursday midnight because that's what the sign says. His sister Jean wants to come of course but she's a girl and Jack doesn't want any silly little girls in his adventure, thank you. She packs up some cakes for him though and sees him off just before midnight with the comforting thought that Jack might allow her to come next time - she's not clever enough or old enough to come this time. The little door leads to Fairyland and Jack sees groups of chattering and dancing fairies in an enormous hall and there's also a large and impressive box to one side with a key in it.
"Beware – Turn Not This Key!"
We know what happens and the rest of the story deals with the ten tasks. The idea is that Jack will have the opportunity to ask Zani, who is chief of the wicked spirits, to perform a task. He'll have ten opportunities and if he strikes on a task that is too difficult for Zani, then the horrible creature will go back into the box. If, however, Jack can't think of something impossible to do then he'll be a slave to Zani for the rest of his life! That premise immediately adds interest to the story and we can only hope and pray that Jack can extricate himself from the predicament he's brought down upon himself.
https://www.docdroid.net/uYdQ9hZ/the-tenth-task-pdf" onclick="window.open(this.href);return false;
Which reminds me, I need to buy some more helium. 
