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    Here's a really quick list of some popular series:

     

    The Hunger Games Triology (The Hunger Games, Catching Fire & Mockingjay) by Suzanne Collins

    The Percy Jackson & the Olympians series by Rick Riordan

    Harry Potter Series by J.K. Rowling

    The Secrets of the Immortal Nicholas Flamel series by Michael Scott

    The Artemis Fowl Series by Eoin Colfer

    The Uglies Triolgy (Uglies, Pretties, Specials) by Scott Westerfeld (Extras is like a epilogue in series)

    Cirque du Freak series by Darren Shan

    Twilight Saga (Twilight, New Moon, Eclipse) by Stephenie Meyer

    Fablehaven series by Brandon Mull

    39 Clues series by various authors (SO MUCH FUN TO READ!)

    Septimus Heap Series by Angie Sage

    Dead Is...series by Marlene Perez

    Death By...series by Linda Gerber

    The Chronicles of Vladimir Tod series by Heather Brewer

    The Slayer Chronicles series by Heather Brewer

    Amulet (Graphic Novel series) by Kazu Kibuishi

    Maximum Ride by James Patterson

    Maximum Ride: The Manga by James Patterson & NaRae Lee

    The Kane Chronicles series by Rick Riordan

    The Heroes of Olympus series by Rick Riordan

    The Bluford Series by various authors

    The Molly Moon series by Georgia Byng

    The Leviathan Series by Scott Westerfeld

    The Dreamhouse Kings by Robert Liparulo

    Ink Triology (Inkheart, Inkspell, Inkdeath) by Cornelia Funke

    Starcatchers Series by Dave Barry

    Skeleton Creek series by Patrick Carman

    The Children of the Lamp Series by P.B. Kerr

    Pendragon series by D.J. MacHale

    The Alex Rider series by Anthony Horowitz

     

     

    In addition to my favorite / popular series listed above:

     

    Number the Stars by Lois Lowry

    The Boy in the Striped Pajamas by John Boyne

    Three Cups of Tea by Greg Mortenson

    The Shepherd's Grand-daughter by Anne Carter

    The Host by Stephenie Meyer

    Bones of Faerie by Janni Lee Simner

    The Grimm Legacy by Polly Shulman

    The One and Only Ivan by Katherine Applegate

    Models Don't Eat Chocolate Cookies by Erin Dionne

    The Total Tragedy of a Girl Named Hamlet by Erin Dionne

    Elijah of Buxton by Christopher Paul Curtis

    Bud, Not Buddy by Christopher Paul Curtis

    The Watsons Go to Birmingham - 1963 by Christopher Paul Curtis

    The Compound by S.A. Bodeen

    Shadow by Michael Morpurgo (author of War Horse)