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Hey there, buddy! After reading your post; I'd say it doesn't really matter which order you read it from! BUT... since you already know the ending in Allegiant, I guess to put you more into it; you should read 'Four' first before you move on to Insurgent! Personally, I'd think it will give you a better view and perspective of Tris and Four's relationship, in addition to the choices they're will make in the last two books! (That's what I'd do if I were in your shoes!)