Story : Teresa's ambulance is hijacked by a thief who threatens to kill her if she doesn't save his brother, who's been shot in the heart during a burglary; Ray and Tom go undercover to track down a trio of larcenous pranksters, who get the scare of a lifetime when they're captured; David has a horrifying time at a Hollywood Halloween party when Andrea breaks off their relationship and Marian accuses him of adultery.