I don't have the strength to write a full review for The Gospel of Loki as I just wouldn't know where to start and where to end. 
 I'm not that well-acquainted with Norse mythology, but I know enough through the number of historical fiction novels I've read (e.g., Giles Kristian's Raven trilogy) - and I guess Marvel's characters may have played some role too. I'd like to say thanks to the initial glossary of characters and who they were, as it was easy to read The Gospel of Loki with something to refer to, but being an e-galley it was quite useless as you don't have the ease to flick back and forth if you need some clarification. So I did find it a bit of a slog but I made do and enjoyed the story in its entirety if I were to read this not electronically. 
 Through her writing Joanne Harris demonstrates Loki's eloquence and smarts, his voice authentic to match the portrayals of Loki we know from previous literature. But this Loki is completely original as well. 
 You don't have to be well-versed in the Norse mythology but it would help to understand the complexities of the relationships and events that Loki discusses and mentions. 
 The Gospel of Loki surprised me - it wasn't what I was expecting, and I'm sure it'll garner its own readers naturally.