Night of Masks and Knives by LJ Andrews — book slip

Malin Strom has spent years searching for Kase, her childhood sweetheart, who vanished during a mysterious masquerade. Her gift for stealing memories leads her into dangerous territory, uncovering secrets of the wicked festival.

When her brother is taken as punishment for hiding her gift, Malin must ally with the Nightrender, a brutal crook who resembles Kase.

Now an amoral leader of thieves, Kase's return reignites their attraction, but also the secrets of his disappearance. As they plan to save her brother, Malin faces a heart-wrenching choice: save her brother or the thief who holds her heart.

First in the Eastern Kingdom arc of The Broken Kingdoms series, this book blends Viking elements with a fairy tale retelling.