St. Louis writer B. Robert Wilson's first book may be a novel, but its inspiration still comes from real-life — the very real life of his great great grandfather.John Lyle Wilson was born a slave, but lived a remarkable life that included fighting on the Confederate lines in the Civil War, fleeing and joining the Union, and, in the aftermath of the war, becoming a landowner with significant holdings in Kentucky. His life is now the focus of The Half Beneath, which was released last week by TouchPoint Press.…