Teardrops In The Night Sky (Steven Gordon Book 1);

Pursued across the great barrier, two self-aware ships and their crews escape with their lives from marauding pirates; but the neutrons from our solar system are deadly to the crews and the ships are soon left desolate and alone. On hearing a distant signal they follow it to Earth.
On Earth young Steven Gordon, a child protegee, is nearly killed in a horrific crash. After being told he will remain in a vegetative state for the rest of his life, his family witness true courage as Steven battles his way back from the brink. Years later he takes up a job with a lifelong friend as a night security guard, but gone is the genius that was the boy. The stage is now set for a miracle and an adventure of a lifetime. Join Steven as he reaches for the sky.