Time's Convert is a bit of a spin off from the main three books in the All Souls Trilogy. While I was happy to see Diana and Matthew, they take a secondary role to the story of Marcus and Phoebe. This book was pretty good, but wasn't as good as the rest of the All Souls books. I just wasn't as invested in Phoebe and Marcus's story. I also don't find Phoebe all that likeable. If you want to delve more into those characters or into Harkness' version of the vampire making process, then it's worth a read. Or if you really enjoy American and French Revolution history.