Spring has come to Minneapolis, bringing with it an unseasonable heat wave...and a chilling end to the longest murder-free stretch the local homicide detectives have seen in years. Two old men died the same night. One was tied to train tracks and left to die. The other was shot in the head beside a greenhouse at the nursery he owned, his body left out in rain that washed the crime scene clean. Other than the fact that they lived in the same neighborhood,...