Catching Midnight is a departure from "Beyond Innocence" & "Beyond Seduction", going from Victorian England to the Middle Ages (although you wouldn't necessarily realise this from the language & attitudes of the characters). It's a good story, interesting and fairly sensual, and by any other author.....
Briefly, Gillian is "turned" by shape-shifting immortals when only 10 years old. She reaches maturity, and begins her journey of independance & discovery. However, as usually seems to happen, she falls for the first (human) man she sees, Aimery, and they have to fight jealousy & mistrust to get their happy-ever-after.
Unfortunately, Gillian is just not very interesting - some feat, considering she is a supernatural being. She wanders round accidentally discovering that she has vast powers, without any guidance, but all that is incidental to rest of the story it seems. A lot of the other characters are frankly more interesting, Nim Wei especially, and Aimery makes a fine hero, although you can't quite work out why he's so taken with Gillian.
The sex is also dull & superficial. Sorry, but it is. There's not much of it, and what there is is treated in a very wham-bam way - there's very little depth or exploration, and yet, frustratingly, there's just so much scope in the characters!
It's as if Emma Holly had an interesting idea, and wanted to write a book about upyrs and shape-shifters & so on, and was obliged to work with a standard formula to ensure the book sold. A bit disappointing.