Calliope had everything she wanted. Then the Khirshans took it away.

Calliope and her Royal Engineers have put Anglia ahead in the race to dominate the skies. Then

the Khirshan Empire abducts Calliope and makes the war personal. Their agents have tried to kill her, to destroy her work, but now they are trying to force her to betray her country and make her their slave.

Alone amongst enemies in a secret workshop buried in a mountain, Calliope swears to destroy everything and bring the Empire to its knees. They laugh at her, but she's not joking.