A Thorn in the Heart — Tim Stafford

Who would possibly want to murder a handicapped teenager and his three friends from the Lambs School? That's what Frank Hager, the father of one of the missing boys, wonders when he realizes his son, Robbie, has been missing ever since he left a local high-school basketball game the night before. Their car has been found buried in snow by the side of the road, but all four boys are missing.
The truth behind this mystery may be more frightening than Hager can imagine.
This book is a true-to-life tale of murder and family heartbreak, justice and forgiveness.