“Cold Case: The Tylenol Murders” is the top TV show on Netflix this week, according to the streamer’s public ranking system.

The docuseries, which debuted on Monday with three episodes, investigates who is to blame for the 1982 killings of seven people in the Chicago area who took extra-strength Tylenol laced with cyanide and died shortly after. The series features interviews with the victims’ families, journalists, federal investigators — and the case’s primary suspect, James Lewis, who gave his last interview about the investigation for the project. He died in July 2023.

Like the title of the docuseries notes, the case is cold, and authorities never found out who was responsible for the deaths. But the series is a gripping exploration of a public health crisis and one of the largest unsolved crimes in U.S. history.

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