This is the beginning of an adventure story about an English schoolboy named Mike, who realizes that he has the ability to move through different dimensions of time.
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The chapter has a good, very believable beginning, about Mike being bullied; which brought back some very uncomfortable memories of my own experiences in school.
The problem I see, is that the character Marty shows up and spends too much time giving too many details about the adventures which Mike will experience, along with why and how these things will be happening. It might be much more engaging, and suspenseful, if Mike didn't have a guide. Mike should discover what's going on, and how to deal with these things by himself. While he obviously would be in need of some guidance, Marty should only show up occasionally, when things are too much for Mike to handle on his own.