I enjoyed the old-fashioned writing, the setting/atmosphere and for the most of it also Cordelia as a character. Also the whole mystery of what was going on was quite interesting.
However,

while I also liked the way the mystery was resolved, some of it was fairly predictable, but that wasn't what really bothered me. I really can't stand that of course Cordelia had to end up with Jason and she somehow had liked him all along?!? After he tried to rape her, seriously? I know this book is a bit older, but come on! And his sudden change of character was also just much too convenient. That really tainted the story for me.