Sacrifice of An Angel, and it has given me appreciation for the skill of authors like Agatha Christie. She must have had a mind like a razor to keep everything straight and know when and where to drop in clues and glimpses of character. Tash and I had to plan Sacrifice very carefully, and even then, sometimes we had to rethink what clues we would drop into the story and when. It's really difficult to balance giving the reader a chance to work out who did what while not giving too much away. To be honest, when you're looking from inside the plot outwards, as the writer, it is very, very difficult to judge. I'd be happy if folks told me they had a pretty good idea who 'done it' by 2/3 of the way through the book, but they couldn't be sure - then I'd think I'd done my job.
Death In The Family first, I and Tash will be starting on the sequel to Sacrifice, where Theo and Remy launch into another investigation whilst dealing with the fallout from Francis' death. We have the book outlined, but we're going to need to sit down together to work through it again, since it's been a good year since we developed the outline. It's a very different challenge working with a writing partner, even if she is my twin; I find I have to be much more disciplined about the whole thing, but since I am having to be stricter with myself and my time planning due to working as a project manager as well, I hope the routine of writing with Tash will help.