I feel like I’m so far behind in reading this trilogy, but finally unearthed these books from storage and keen to get to completing the series this year. For some reason the cover art spoke to me in hues of rocks, fossils and crystals. Not a bad aesthetic if I do say so myself.
Casey Carlisle 
Ah I love this trilogy! They remain to be my favorite books from Marie Lu! I hope you finish them sometime 😀 And love the picture. The rocky terrain definitely complements those covers.