Ruby is missing.
And for once, Hat has the house all to himself.
Which sounds excellent… until it turns out that waiting for your best mate is actually incredibly boring.
Hat searches the house, checks the backyard, retraces their favourite adventures and even asks a few highly suspicious household objects for clues.
But this isn't really a detective story.
It's a story about missing someone you love, watching your best friend grow up, and discovering that growing bigger doesn't mean growing apart.
A gentle, funny and slightly wobbly Hat Business adventure for kids and grown-ups about friendship, growing up and the people who make ordinary days feel like adventures.
And don't worry. Ruby does eventually come back.