Hulu is taking viewers back into one of California’s most disturbing criminal investigations with the release of The Well, a six-part true-crime docuseries examining the decades-old crimes associated with the Speed Freak Killers.

The series premiered Nov. 9 and follows investigators as they reopen cases involving convicted serial killers Loren Herzog and Wesley Shermantine. Their crimes continue to haunt California’s San Joaquin County, where more than 200 unsolved murders remain part of a broader investigation into missing victims and unresolved cases.

Produced by Fox Entertainment Studios, Mountain Top Pictures, Haven Entertainment and Fairvale Entertainment, the series examines the challenges facing investigators as they attempt to identify victims and locate remains that have never been recovered.

Key Takeaways

1. Hulu's six-part docuseries The Well revisits the crimes associated with the Speed Freak Killers.
2. The investigation focuses on more than 200 unsolved murders in California's San Joaquin County.
3. Lieutenant Linda Jimenez leads a newly formed cold case unit searching for missing victims.
4. Investigators examine hand-drawn maps provided by convicted killer Wesley Shermantine.
5. Shermantine died in prison in September 2026. His former accomplice, Loren Herzog, died by suicide in 2012.
6. All six episodes are available to stream on Hulu.

Investigators Reopen Decades-Old Cold Cases

At the center of The Well is a newly established cold case unit led by Lieutenant Linda Jimenez.

Jimenez and her team are determined to revisit unresolved investigations and locate the remains of victims whose families have spent years waiting for answers.

The investigation brings renewed attention to Herzog and Shermantine, childhood friends who became known as the Speed Freak Killers because of their methamphetamine use and crimes.

The two men were initially convicted of four murders, including three committed jointly. However, investigators have long suspected their involvement in numerous additional killings.

The docuseries examines the possibility that the pair were responsible for far more deaths than those established through their convictions.

Shermantine’s Maps Could Hold Important Clues

One of the most significant elements of the investigation involves Shermantine's hand-drawn maps.

Investigators turned to Shermantine for information about the locations of victims' remains. His cryptic drawings could provide important clues about possible burial sites and help detectives narrow their search.

However, obtaining reliable information presents its own challenges. Investigators must assess the information provided by a convicted killer while navigating the complicated history of the cases.

The series also explores the emotional impact of the investigation on families who continue to seek answers about missing loved ones.

Shermantine died in prison Sept. 17, 2026, while on death row. His death adds another layer of urgency to the investigation, particularly as detectives work to evaluate information that could help locate additional victims.

Herzog died by suicide in 2012.

Production Team and Worldwide Distribution

The Well is produced by Fox Entertainment Studios, Mountain Top Pictures, Haven Entertainment and Fairvale Entertainment.

Rachel Witte, Michael Bott, Toby Louie, Nicolas Levene, Kevin Mann and Mark Ankner serve as executive producers. Michael Horn serves as co-executive producer.

Fox Entertainment Global handles worldwide distribution of the series.

With six episodes examining the investigation, the documentary offers viewers an inside look at the complexities of reopening cold cases, the challenges of working with convicted criminals and the continuing search for answers.

For families affected by the crimes, the investigation represents more than a historical examination of notorious killers. It is an ongoing effort to locate missing loved ones and provide answers to questions that have remained unanswered for decades.

All six episodes of The Well are available to stream on Hulu.