Dead ends - Erin Lange

A riddle rarely makes sense the first time you hear it. The connection
between Dane and Billy D doesn't make sense any time you hear it. But
it's a collection of riddles that brings these two unlikely friends
together.

Dane Washington lives by two rules: don't hit
girls and don't hit special kids. Billy D has Down's Syndrome and thinks a
fierce boy who won't hit him could come in useful. Billy D has a puzzle
to solve, after all, and he has the perfect plan to make Dane help him.

Billy is sure the riddles in his atlas are really clues left by his
missing dad. Together, Billy and Dane must embark on an epic road trip,
although most of the clues lead to dead ends. What Dane doesn't realise
is that Billy D isn't as innocent as he seems and the biggest secret is
hidden close to home...