The Voyages Of The Seven by R.E. Weber

The Seven: the first wave of humanity among the stars.

Theopolis James Logan is finally living his long-cherished dream. Whisked away from his mundane life on Earth - along with six other gifted teenagers - by an alliance of peaceful, alien civilisations known as The Affinity, he has forged a life of excitement and wonder on another world. To his friends, he is a technical specialist, adept in the use of super-advanced technology. However, in secret, he is a covert operative for The Star Agency: the Affinity’s secret service, defending the galaxy against the shadowy forces of the Metah Dah, the Affinity’s sworn enemy.

For centuries, the Star Agency has helped maintain a fragile peace, but when a devastatingly powerful secret weapon is lost, presumed stolen, it sets in motion a chain of events, pushing the Affinity towards the brink of war and plunging the seven human friends into a nerve-shredding battle for survival. Can they survive in a universe more dangerous and unpredictable than they can possibly imagine, or will the dark forces of the enemy triumph, tearing the Affinity apart?

Meanwhile, back on Earth, an old friend is looking for answers.