A known doctor is killed and his wife (played by Lisa Eichhorn) is raped. Detectives Benson and Stabler question the doctor's estranged and troubled son from the doctor's previous marriage. They also locate a former patient who holds a grudge against the doctor. When the rapist then attacks the doctor's former mistress (played by Liza Weil), they realize both the wife and mistress know more than it seems.