Legion - Brandon Sanderson
Seriously? Why hasn't this story been turned into the coolest mystery solving TV series yet? It would be so cool . . .

Steve is the smartest person alive. He is fabulously wealthy because his brilliance is in high demand--he can solve crimes and mysteries better than anyone. Steve is also crazy . . .

He doesn't like being smart, so he's invented "aspects," hallucinations that represent a different part of his brilliance. He converses with them and they help him solve mysteries--but of course he's the only one who can see them. It's like imaginary friends gone wild! He travels first class, but demands that he have 5 first class tickets. He orders his butler to bring drinks for him and all his "friends." His hallucinations even fall in love with each other . . .

In the book, the idea works fantastically. It'd be a really cool TV show. I'd watch it anyway.

Fun story by the most up-and-coming author on the planet.