When the going gets tough, what's a wimpy kid to do? In Fight or Flight , Greg Heffley faces his biggest challenge yet as he becomes a target for the school bully. Luckily for Greg, his best friend, Rowley Jefferson, takes karate, so at least Greg's got someone in his corner. But an unexpected twist makes Greg realize he's facing an uphill battle. Will Greg step into the ring or throw in the towel? 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.