Note to self - Look to see if the book you want to read is a sequel. Not only is Frankenstein: Lost Souls by Dean Koontz a sequel, it is Book 4 in the Frankenstein series. For most of the book I had no idea what was happening, but didn't really care. The writing is mediocre. Most of the characters are superficially developed. There are so many people in the book, they almost fight for attention. It was impossible to keep track of any of them, so I didn't care which humans were killed by the replacements. The book was very slow, even though there were brief scenes of intense action. Dean Koontz knew he was going to make another book, so he doesn't even try to bring the book to any kind of conclusion. The book just stops. I hated the book and will not go back and read the earlier books or the next one in the series. Unless you are a fan of the series already, I do not recommend this book.