I must admit, I decided to read the books, because I started watching the show, and wanted to know what happens. Yes, I know books and shows are hardly ever the same. Well, that happens to be the case with this book. The show and book are really nothing alike. Maybe some of the characters are the same, and one or two things from the plot is the same, but that is it. 
 Some reviews I read, people were confused on who was who, I guess watching the show first, sort of helped with that. Because I already knew who was who and what they had to do with the story. I really like the different POV's, and how Ingrid, Freya and Johanna had their own lives, but were there to help each other. The only thing that bugged me, is that the SPOILER!!!!!!!!!!! she just jumped into the Norse Mythology, without giving any explanation on why? Aren't they supposed to be Witches? Sort of confused. I am not saying that it's a bad thing, because I love witches and mythology. But I think if you want to combine the two, make sure that you connect the dots, and not leaving the plot holes. I might stick it out and read the next book, just to see if she explains the whole Norse Mythology and Witch.