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Floyd is a rising teen tennis sensation. At only fifteen, he is set to become the youngest ever champion of the national under 18s, his tennis career is written in the stars. Until Mike shows up. At first, Floyd thinks Mike is just a weird kid following him around. Why else would he be at tennis practice in the school so early? But when he appears on the tennis court in the middle of the match, Floyd can't understand why everyone is acting so calm … until Floyd realises he is the only one who can see him. Floyd is referred to a specialist and together they unpick the mystery of Mike.