A documentary series that explores an investigation led by freelance writer Danny Casolaro on what he called "The Octopus," an elaborate conspiracy network involving the United States government and its covert operations. The series stems from the circumstances around Casolaro eventually being found dead in a hotel room. Researcher Christian Hansen revisits Casolaro's work and questions whether Casolaro actually died by suicide. The series tracks Casolaro investigating the circumstances around Inslaw's PROMIS software, a database system built to to aid law enforcement and legal prosecutors in tracking court cases, which the Department of Justice began using, stopped paying for, and then was later accused of stealing. The Iran-Contra affair also features, and the 1980 'October Surprise', where Ronald Reagan's presidential campaign covertly negotiated with Iran to delay the release of American hostages until after the election to influence its outcome. Through a cast of shady characters, the corporate world, spies, and interesting real and theorised information, The Octopus Murders is a murder mystery wrapped in major 20th-century scandals.