MuMu is not quite MuMu today. But with enough good cheer and fun, can her best friend Lox put things right? MuMu is not having a good day. Nothing can put things right. AND THAT'S THAT. Her best friend Lox knows her better than anyone, but does he have enough tricks up his sleeve to put things right? A rattly rollercoaster of a story from award-winning author/illustrator David Mackintosh, this bright and witty story of friendship, patience and modern construction methods will have you wishing for a best friend like Lox.