At Tor.com she tagged five book where it's unclear which side we’re supposed to be rooting for, including:
Three Dark Crowns by Kendare BlakeRead about the other entries on the list.
This book took the young adult fantasy genre by storm when it pitted triplet sisters, each raised separately on the island queendom of Fennbirn, against each other in a deadly battle to see who will become the next queen. In the opening chapters, it might seem obvious which sister is meant to be the victor, but as we’re given glimpses into each of their minds, strengths, and histories, the answer becomes increasingly more difficult to detect. By the end of this book, I was left entirely blindsided, with no clue which direction the story might go, who I hoped would win the crown, and which of the sisters, if any, would ultimately survive. Kendare Blake’s ability to build up the conflict and the constant twists and turns makes for a breathtaking read.
--Marshal Zeringue