** SPOILER ** It's subtle, and took a couple of viewings, but the ending works like this: After everyone is dead, the jolt Mona received from her dying friend cures her. She can no longer hear voices. She returns to the apartment. Her husband, who has masterminded the KM Inc takeover, wants to kill her. He starts a tape in the tape player that contains voices like the ones that Mona used to hear. Mona things her ability has returned, and goes bonkers. Her husband is about to strangle her, but Mona, distraught over her returned ability to hear voices, jumps out the window of her own accord and commits suicide. At the next-to-last scene, her husband turns off the tape player and the voices stop.