Following an anonymous tip, police enter a mansion in Rancho Santa Fe, an exclusive suburb of San Diego, California, and discover 39 victims of a mass suicide. The deceased—21 women and 18 men of varying ages—were all found lying peaceably in matching dark clothes and Nike sneakers and had no noticeable signs of blood or trauma. It was later revealed that the men and women were members of the “Heaven’s Gate” religious cult, whose leaders preached that suicide would allow them to leave their bodily “containers” and enter an alien spacecraft hidden behind the Hale-Bopp comet.

The cult was led by Marshall Applewhite, a music professor who, after surviving a near-death experience in 1972, was recruited into the cult by one of his nurses, Bonnie Lu Nettles. In 1975, Applewhite and Nettles persuaded a group of 20 people from Oregon to abandon their families and possessions and move to eastern Colorado, where they promised that an extraterrestrial spacecraft would take them to the “kingdom of heaven.” Nettles, who called herself “Ti,” and Applewhite, who took the name of “Do,” explained that human bodies were merely containers that could be abandoned in favor of a higher physical existence. As the spacecraft never arrived, membership in Heaven’s Gate diminished, and in 1985 Bonnie Lu Nettles, Applewhite’s “sexless partner,” died.

During the early 1990s, the cult resurfaced as Applewhite began recruiting new members. Soon after the 1995 discovery of the comet Hale-Bopp, the Heaven’s Gate members became convinced that an alien spacecraft was on its way to earth, hidden from human detection behind the comet. In October 1996, Applewhite rented a large home in Rancho Santa Fe, explaining to the owner that his group was made up of Christian-based angels. Applewhite advocated sexual abstinence, and several male cult members followed his example by undergoing castration operations.

In 1997, as part of its 4,000-year orbit of the sun, the comet Hale-Bopp passed near Earth in one of the most impressive astronomical events of the 20th century. In late March 1997, as Hale-Bopp reached its closest distance to Earth, Applewhite and 38 of his followers drank a lethal mixture of phenobarbital and vodka and then lay down to die, hoping to leave their bodily containers, enter the alien spacecraft, and pass through Heaven’s Gate into a higher existence.