William and Thomas are at it again - solving crimes, uncovering mysteries and munching their way through a seemingly endless supply of Ginger Nuts!

What is the true meaning of the secret message?
Who has stashed a locked trunk in the shed at the old house?
And what's inside?
Who is stealing pedigree dogs?
How will William and Thomas survive their adventure in a runaway balloon?

Can you help William and Thomas with their crazy enquiries?