This was a weird one. . .people were enslaved by a siren-type song, and then they became zombies who had to be imprisoned or killed. There was one woman who was trying to find who/what was responsible, and she began to blame another woman who'd been there since the beginning. Protagonist's husband was also one of the victims.
(also, side note that is totally irrelevant: protagonist was Tina Fey and antagonist was Amy Poehler LOL)