— An ancient alliance under siege ...

— A threat for which we are not prepared ...

— And "Grey" aliens who are not at all what we expected.

The enigmatic Greys have returned, bearing a host of stunning revelations regarding their role in Earth’s history, the Pelarans, and Humanity’s place in the cosmos.

The Pelaran Alliance has effectively disbanded, and Pelara itself is now dominated by the same world-shaping AI originally created to manage its own cultivation program. Armed with this new information, Terran Fleet Command must decide if coming to Pelara’s aid is worth risking a direct confrontation with the AI-controlled remnants of their once-mighty Alliance.

Griffin, openly declaring his allegiance to both TFC and the world he has helped to build, agrees to accompany the Grey ship Ethereal on a high-risk recruiting operation spanning thousands of light years. Their mission: enlist the help of enough Guardian spacecraft to put an end to the out-of-control, tyrannical AI before its forces can reach the Earth.

Captain Tom Prescott and the crew of TFS Fugitive, joined by allies both old and new, must reach Pelara and take the fight to the Alliance AI at the very center of its power. While in the Sol system, Admirals Patterson and Naftur fight a seemingly hopeless battle to save both Earth and Graca from certain destruction.

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Author's Note: The books in this series build on one another and are not intended to be read as "stand-alone" stories. Please read TFS Ingenuity, TFS Theseus, TFS Navajo, and TFS Fugitive before starting TFS Guardian. TFS Guardian is the final book in the original Terran Fleet Command Saga.

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TFS GUARDIAN is the fifth book of the Terran Fleet Command Saga by author Tori Harris. The story is typically associated with the military science fiction, space exploration science fiction, colonization, first contact, genetic engineering, space opera technothriller, galactic empire, or alien invasion categories.