From the Back Cover:
A battle rages across the stars. You are the weapon.
Set 120 years in the future, Trinity takes place in a time when humankind is beginning to understand its greatest potential - psi, the raw power of the mind. And yet at the dawn of a new era, humanity must face a horror from its past - the return of its prodigal children, the Aberrants.
Unbelievably powerful mutated humans who left Earth a half century ago, the Aberrants are now obsessed with regaining their homeworld. Inbreeding has worn away any resemblance the Aberrants bear to humanity, and has resulted in powers exponentially greater than that of the Aberrants who left Earth a half century ago.
With conventional technology unable to withstand the Aberrant skirmishes, and the psionic orders scattered across the globe, planet Earth seemed doomed. That is until an almost unknown organization called the Æon Trinity extended a hand from the shadows. Æon united the orders into humanity's first line of defense.
And thus it begins. You fight the Aberrants at home and in the heavens. You encounter races born of the stars. You strive to discover the lost colonies of man. You are the future of humanity, and the laws of nature bow to your whim.