Joey lives on a farm with his mum, his grandad, and his best friend - Riley, a working dog. Joey and Riley are inseparable, sharing adventures all day long. But times are tough, and Joey and his mum have to move to town so that she can find work. Joey misses Riley desperately, relying on his grandad's letters to stay connected to his best mate. Until the day Grandad writes with sad news: Riley has gone missing in a big storm. Joey is devastated - but things might not be as they seem ...