Willow Moss, the youngest and least powerful sister in a family of witches, has a magical ability for finding lost things - like keys, or socks, or wooden teeth. Useful, but not exactly exciting . . .

Then the most powerful witch in the world of Starfell turns up at Willow's door and asks for her help. A whole day - last Tuesday to be precise - has gone missing. Completely. And, without it, the whole universe could unravel.

Now Willow holds the fate of Starfell in her rather unremarkable hands . . . Can she save the day - by finding the lost one?