I seem to have hit a rut. I've been working with this same idea (though it has evolved several times) for years, and every time I come back to it, I keep reviewing the same details, without adding anything new. I have the same main character, the same love interest, and the same basic plot. While the characters are now much more developed from their original, flat-surfaced selves, I still find myself with giant, gaping holes in the rest of my story that can't seem to get filled. Any suggestions? Is this some form of mutated writer's block? Things I can't seem to fill out: the villain, supporting characters, and a setting. I have vague ideas about these things, but I can't put in the tiny details.