Jobbing writer

Well, time for a decision. I was asked, quite sensibly, if that was the last chapter of The Job. It is an obvious place to end, and a scene I loved writing, but Diane still has a long way to go. So...

Do I continue writing this as one book?
Do I split it and start another book, continuing the story, as I did with 'Ride On' and 'Too Little, Too Late'?
Any sensible ideas for a title if I make the split? I have some already.