Labor Day [sic]: suspiciously familiar

Now that Labor Day [sic] is out in cinemas and we can all enjoy Josh Brolin sticking his fingers in Kate Winslet's moist, warm peach pie, I think it may well be time to lift the lid on its source material. Jason Reitman might claim that he based his screenplay on Joyce Maynard's book of the same name, but from where did Joyce get the idea? The answer to this question, as the answer to most