The discovery of a prosthetic arm in the river leads detectives to look into the case of a woman in the National Guard who went missing shortly after returning from a tour of duty in Iraq, where she lost an arm. Detectives learn she had trouble fitting back into civilian life and that she was haunted by memories of her time "over there". Meanwhile, Scotty lets his brother Mike know the man who was Mike's boxing coach as a boy was being charged with molesting a boy.