So far I've only read 2 books by V.E Schwab, being Addie Larue & The Near Witch. So this is the first big world fantasy of hers I've read. I went in with the understanding that I didn't need to have read the Shades of Magic trilogy first to be able to follow this book, however there were parts that I found confusing and plot holes I imagine would be filled having read the first trilogy. 
I don't know if it would have been easier to follow having read it as apposed to listening on audiobook, I think for me personally there was just too much going on to follow it seamlessly as an audiobook.
I'll definitely be going back and reading the Shades of Magic trilogy having received it at Christmas!