Bitter Waters acts by way as a coda to the full length novels in Vivian Shaw's series about Greta Helsing, the doctor who treats monsters (vampires, barrow wights, ghouls, etc). In it, she and Varney are married (with Emily staying at Dark Heart as well, still studying to become a vet), Ruthven and Grisaille are settled together in London, aaaand someone brings a young, newly-turned vampire to Varney for help, kicking off a (shortish) adventure to discover just who would turn a child into a vampire, and also what should be done about her.

It features most of what I love about the series, with Ruthven's need to help people, Varney's burgeoning interest in caring about people, and neat tie-ins with existing monster literature. This time, we even get to see Dracula himself...

It's short and sweet, and there isn't much by way of action. I wouldn't really recommend it for someone who doesn't already know these characters -- but for those who do, it's a nice revisit.