I had a hard time getting through this one.
Sabrina's cousin goes missing and S finds a parallel world where it's all Victorian and vampires rule and she meets the original Drakyla.
The best part of this is learning about what happened to Dante who is S's true love soul mate. Their story is probably the best of all of this, although it's bittersweet.
It starts with an odd wedding ceremony with Vasyl, and a huge fight between V and S. Tremayne is trying to get his power back from Ilona and Nicolas. Hobart's around, but not prominent in this one. Sabrina learns how to travel using Ley Lines and it's through this where she finds the parallel world. There's a new love/mating interest in Jett, Drakyla's son, and a new vampire, Drachen.
I'm still not sure what the point of all of this was except to get Sabrina to learn more about her Sibyl powers.