Fiction inspired by fiction

How one book leads to another is something I've always found fascinating. I'm now reading A Passage to India, as inspired by Kate Christensen's Trouble and its Marabar Caves reference. Kate Sutherland asked about this recently (on FB, I think): fiction reading inspired by fiction reading, and she cited reading The Epic of Gilgamesh because of The Girls Who Saw Everything. I know that I watched Vertigo after reading Francine Prose's Goldengrove, but can't think of any other fiction I've read directly inspired by fiction off the top of my head. I've been meaning to get around to reading Great Expectations as inspired by Mister Pip, but as I haven't yet, I don't think it counts.