I’d rather that then the film be about the character abandoning his kids. To me the Roy character was just another selfish asshole that the human race would be much better without (so I guess it did have a happy ending, lol). Anyway, he’s not something I can or want to relate to. And it wouldn’t have had to have been about her finding her son. The obsession could’ve consumed her and then her son’s disappearance could’ve prompted her to go searching. It would take some changes to the script, but it could’ve worked more or less the same.