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On the fifth step, she heard the bolts snap. The wires tore loose, like tendons stretched to the max. She felt the loss of power at the base of her calf.

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"She spoke without feeling, unburdened by love or dreams or the pain of a broken heart. It was a new day.

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In Cinder, there is also a bad ending. Before it ends, Cinder goes to the ball, and dances with Prince Kai. Queen Levana goes to the ball and forces Cinder to shoot herself with mind control. She runs out of the palace but she loses her cyborg foot. Prince Kai now knew that Cinder was both a cyborg and a lunar. Cinder knews Queen Levana's true identity, so Cinder is Queen Levana's target to hunt for.

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In Heartless, there is a bad ending. For example,  Heartless ended with Catherine being sad after someone murdered Jest. She had to marry the King to get revenge on the murderer (Peter) even though she didn't want to marry the king in the first place. In conclusion, Catherine had a really bad ending and in the conclusion, became Heartless.

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"Life isn't always about happy endings and people should prepare themselves that there may be sad endings too."

I think the author believes that life isn't always about happy endings and people should prepare themselves that there may be sad endings too.

(The theme I think both books have are that not all books have a happy ending in the end, sometimes, characters of the book may not be happy at the end even though of what the character accomplished.)