Book 4 - Mercys End

Centuries after Lina reshaped the world, Adam walks the dead highways searching for the place where humanity first collapsed, Mercy’s End. Haunted by inherited memories and pursued by versions of Lina that should not still exist, he crosses landscapes where biology and circuitry have fused into something hungry. When he meets a strange child fishing for memories and a garden blooming with failed versions of Lina, Adam discovers he is not here to stop her, but to understand the one truth everyone else died refusing to see: Lina never ended, she only changed shape.