The General's Son by Charlotte Goodwin (The Offspring Trilogy, Book 1)

Two worlds, one wormhole and magic that spans galaxies.

Garrad doesn't know how to wield magic; his skill with a blade is enough. He just wants to be a soldier, but his bloodline sees him given a role he didn't expect. He is charged with protecting two wayward princesses: two women who don't need a minder - or so they think.

Garrad had no idea there was life on other planets and he'd never heard of Earth. But when the princesses are captured by an old enemy, he has no choice but to follow them to another world. The man who holds them has magic, somehow, and everyone else has guns. Garrad just has a sword.

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