When the going gets tough, what’s a wimpy kid to do?Nobody knows how to survive the rough and tumble halls of middle school better than Greg Heffley. In fact, he's got a three-ring binder chock-full of notes on his school's biggest bullies—along with his hard-earned strategies for how to outsmart them.But when Greg's binder falls into the wrong hands, his world starts to unravel. Now it's a race against time before the bullies discover the identity of the person behind it.Greg has learned to roll with the punches, but now he's backed into a corner with no good options. Will he throw in the towel, or go down swinging? One thing’s for sure—Fight or Flight is a knockout!Collect all the books in the #1 bestselling Diary of a Wimpy Kid series: Diary of a Wimpy Kid (#1) | Rodrick Rules (#2) | The Last Straw (#3) | Dog Days (#4) | The Ugly Truth (#5) | Cabin Fever (#6) | The Third Wheel (#7) | Hard Luck (#8) | The Long Haul (#9) | Old School (#10) | Double Down (#11) | The Getaway (#12) | The Meltdown (#13) | Wrecking Ball (#14) | The Deep End (#15) | Big Shot (#16) | Diper Överlöde (#17) | No Brainer (#18) | Hot Mess (#19) | Partypooper (#20) | Fight or Flight (#21)See the Wimpy Kid World in a whole new way with the #1 bestselling Awesome Friendly books, told from the perspective of Greg Heffley’s best friend Rowley Jefferson: Diary of an Awesome Friendly Kid: Rowley Jefferson’s Journal | Rowley Jefferson’s Awesome Friendly Adventure | Rowley Jefferson’s Awesome Friendly Spooky Stories | Rowley Jefferson’s Awesome Friendly Spooky Stories 2