Dr. Finlay's Casebook (1962)

S5E19 Betrayal

Teresa Cruz, Bobby's sister, is traumatized after seeing a fellow student take her own life, soon becoming entangled with the deceased girl's cunning boyfriend. Meanwhile, a determined new officer at Pacific Blue, who is secretly working for Internal Affairs, finds himself caught up in the young team’s plan to set up a dangerous drug lord. As the situation evolves, loyalties are tested, and the line between right and wrong blurs, leading to unforeseen consequences for everyone involved.