The Beginning: Chapter 1 - the prologue, presenting the major conflict
Act 1: Chapters 2-4 - exposition of characters, setting, minor conflict
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Plot point 1: chapter 4
Act 2: Chapters 5-17 - the flesh of the story, with rising and falling action
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1st climax: chapter 10
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Midpoint: chapter 11
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Plot point 2: chapter 17
Act 3: Chapters 18-22 - rising action towards major climax, then denouement
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2nd (and most important) climax: chapter 20 (a two-parter)
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Denouement: chapters 21-22
The End: Chapter 23 - the epilogue, a glimpse into the future
For those who wonder (and are interested), the plot points are the two twists that spins the story in a new direction, hence the act shift. The first plot point was Atlantis landing on a new planet, starting things over again after the chase.