There are 2 books in the Prisoners of Peace series. The newest book is The Swan Riders which came out in 2016.

1
The Scorpion Rules

Book cover of The Scorpion Rules
The children of world leaders are held hostage in an attempt to keep the peace in this “slyly humorous, starkly thought-provoking” (Kirkus Reviews, starred review) novel.

Greta is a Duchess and a Crown Princess. She is also a Child of Peace, a hostage held by the de facto ruler of…
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2
The Swan Riders

Book cover of The Swan Riders
Treacherous twists await Greta as the stakes get even higher in this stunning follow-up to the “masterful” (School Library Journal, starred review) novel, The Scorpion Rules.

Greta Stuart has become AI. New transmitters have silvered her fingerprints. New receptors have transformed her vision. And the whole of her memory has…