I wasn't sure about this when I started it. It had been so long since Timeless that I forgot about many of the things that were resolved in that book, and I still don't really remember how certain things came about, but you don't really need to have read Timeless to enjoy Prudence. I do wish it hadn't taken quite so long to get to the action, but when it did, I was hooked. I'm glad I waited a while after this came out to read, because now I won't have as long to wait before the next one!