Rosie didn't really want to move to a tiny cottage by a loch on the Isle of Skye. But the place is so beautiful, and her mum is so much happier here - Rosie just wishes Mum hadn't left Dad behind in London.

Then Rosie finds a tiny stripy sock in her bedroom, and she's sure that only one thing could fit it - a fairy! Mum tells Rosie not to be so silly, fairies don't exist. Then the old lady who lives next door tells Rosie that Mum's the one who's silly, fairies are everywhere if you know where to look.

Rosie's not sure who to believe until she sees something in the grass at the top of the moor, and then she can hardly believe her eyes. It looks like a butterfly, or a small bird - only different. It's fluttering and tiny and magical. Could it really be a fairy?