A wonderfully warm story about the irrepressible Tilly, from bestselling author Hilary McKay

Tilly's little brother Timmy used to be as good as gold. But now he makes all sorts of chaos during the night and won't go to sleep. It's the fault of his imaginary friend, Naughty Morgan. He's the boss around here now.

Can Tilly find out how to tame Morgan before her parents are forced to sell Timmy on Ebay?