Minecraft Book triggers

No.

It's not possible to trigger anything when the player reaches a certain page in a book.

The best you can do is to either

• trigger something whenever the player opens the book by having a scoreboard with the stat.useItem statistic of the book (archive)
• or by letting the player click onto something in the book by giving the text in it a click action.

Update in 1.14: You can use a lectern (archive) instead of a book in the hand. A comparator getting a signal from it shows you the page it's currently on. The power level is the progress in the book spread evenly over the power levels 1 to 15.