Paul Chalmers: 2 books

A boy wakes up in a hospital.  He is seriously ill, with no memory of who he is, or where he has come from.  He soon discovers there are others like him – the last survivors of a larger group of sick children who are now lost. When unexplained incidents begin happening to the children, they wonder...

Nathan is no ordinary boy.  And his life is not ordinary, either.  In fact, it has been turned upside down ever since he awoke from a coma just days ago.  Half-human and half-angel, he discovered his gift of extraordinary powers.  He now finds himself the reluctant leader of a group of time-traveling...