Sarah J. Maas Crown of Midnight Book

Product description from producer

The most fearless of all assassins, Adarlena is only eighteen. Selena is an outstanding assassin who has won dangerous competitions and the title of royal protector. However, she has been promised the freedom she covets, but in return, she cannot even give her heart a chance. If she kills the enemy she hates in cold blood, it will mean a death sentence for the most precious thing in her life. It would seem that the choice is simple, for she is a murderer. But does a killer have a heart? In any case, Selena will decide what to fight for: for love, for survival, or for the future of the kingdom. 

Number of pages: 528.