The Impossible Challenge

Robin was safe now, they were all safe now, safe and normal. Well, as normal as the McRackers and the Jamesons could be in this world. Robin liked normal. Normal was good but somewhere in the back of his mind he just knew that it couldn't last, and he was right; the next nightmare was waiting for him at the base of a very ordinary red post box and it came in the shape of an impossible challenge.