Shards of earth
(Book)

After Earth was destroyed mankind created a fighting elite to save their species, enhanced humans such as Idris. In the silence of space they could communicate, mind-to-mind, with the enemy. Then their alien aggressors, the Architects, simply disappeared. The war over, its heroes forgotten, Idris has neither aged nor slept since they remade him. He scrapes by on a freelance salvage vessel, to avoid the attention of greater powers. Now, fifty years later, his crew has discovered something strange abandoned in space... something many would kill to obtain. It's clearly the work of the Architects-- but are they returning? And if so, why? -- adapted from jacket