Defy Me by Tahereh Mafi

Defy Me is the fifth book in the Shatter Me series.

Juliette’s short tenure as the supreme commander of North America has been an utter disaster.

When the children of the other world leaders show up on her doorstep, she wants nothing more than to turn to Warner for support and guidance.

But he shatters her heart when he reveals

that he’s been keeping secrets about her family and her identity from her—secrets that change everything.

Juliette is devastated, and the darkness that’s always dwelled within her threatens to consume her.

An explosive encounter with unexpected visitors might be enough to push her over the edge.