I'm just about to carry on with chapter 11 of Inescapable Ties. The tone of the book couldn't be more different to ItFP.
I've been asked how I can work on two wips at once. Having very different subject matters helps a bit. It helps that I know (sort of, my Muse definitely knows but isn't spilling the beans) what is happening in each chapter. The more time I spend on both, the more natural it seems. Sometimes I do wish characters could cross over into the books because it would add chaos to the story, but there's a reason why they are in different wips.