The novel I'm working on, Chains, is science fictional in some respects but really mainstream, so I'm dealing more than before with making all the character inner stuff work properly, because that's the main focus. It's so much easier when you can solve a problem by having someone jump into a time machine or spaceship, or have two men burst through the door with guns blazing.
No wonder there are almost no worthwhile mainstream writers. Oops, sorry, that just slipped out.
Anyway, it's fun and fulfilling, and I'm feeling hopeful that this book will be a rip-snorting, bell-ringing, guns-blazing page turner of a, er, serious mainstream exploration of the human condition.