S02:E09 - The Lost Boy

When Rocket and Dibber find an old, rusty harmonica T.O.M tells them it's The Lost Boy's, he was the only one who could get a tune out of it. A boy went missing years ago, leaving a huge reward to be collected if anyone can find any information on him. When a mysterious new foster kid arrives at the Knot, Rocket and Dibber become convinced that there is more to him than meets the eye. Archie is a selective mute, never takes his coat off, and closely guards his suitcase. When the boys they find Archie eerily playing the harmonica they realise that Archie must be The Lost Boy! But after a wild goose chase it soon becomes clear that Archie tricked them and Rocket realises he was just trying to find a way to be part of the family.