Harry Potter and the Order of the Phoenix by J.K. Rowling

Harry Potter is due to start his fifth year at Hogwarts School of Witchcraft and Wizardry. He is desperate to find out why his friends, Ron and Hermione, have been secretive all summer. But before he even gets to school, Harry survives a terrifying encounter with two Dementors, attends a court hearing at the Ministry of Magic and is escorted on a night-time broomstick ride to the secret headquarters of a mysterious group called the Order of the Phoenix. From Goodreads

The books are getting more sinister. Harry is feeling left out as he doesn't know what is happening and even when he gets together with Ron and Hermione it doesn't get better. The really brilliant but very nasty new character in this book is Umbridge who will do anything to keep Fudge as Minister of Magic. She slowly but surely takes over the school.

This book qualifies for:
Goodreads Reading Challenge 2015
2015 Witches & Witchcraft Challenge
Novel Books & Reading Challenges Wheel-A-Thon II
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A Million More Pages Hogwarts: I Like Big Books Bonus Club
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