"Many of us were taught that no sentence should begin with "but." If that's what you learned, unlearn it - there's no stronger word at the start. It announces a total contrast with what has gone before, and the reader is thereby primed for the change."

Next Quote

In journalism just one fact that is false prejudices the entire work. In contrast, in fiction one single fact that is true gives legitimacy to the entire work. That's the only difference, and it lies in the commitment of the writer. A novelist can do anything he wants so long as he makes people believe in it.

— Gabriel Garcia Marquez