You've watched Mastermind: To Think Like A Killer. What's next?
the true crime that's worth your time
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Mastermind: To Think Like A Killer dropped on Hulu Thursday, July 11, and it's pretty much what you'd expect from a streaming-service three-parter in the genre. Returning to the oft-told origin story of the FBI's Behavioral Science Unit (BSU), Mastermind sets up from the perspective of Dr. Ann Burgess, already a pioneer in victimology and sexual-assault research; based, I think, partly on Burgess's book with Steven Constantine, A Killer by Design, it includes talking-head interviews with Burgess, Constantine, and many others, plus the serial-killer-interview audio that powered much of the BSU's early profiling attempts, and deeply Carter-presidency b-roll and re-enactments.

Series director Abigail Fuller (the Oprah episode of Dear..., among other projects) is occasionally heard from off-camera, and it's clear Fuller is invested in the topic. She has a sure touch with vintage visuals; Mastermind is very watchable. Alas, this ground is beyond well-trodden, and a project about Burgess's contributions probably should have gotten its bite at this subject apple much sooner in order to feel satisfying. It's good, but it might not feel like a full meal at this late date.
So, if you've watched Mastermind -- or stopped because you wanted more of a particular aspect of the docuseries -- here's what I recommend next.
Close "relatives" of Mastermind
Netflix's Mindhunter // Burgess is renamed Wendy Carr and reimagined pretty significantly (not least in the casting of Anna Torv); to my mind, the best possible packaging of Burgess's story was with this property, but it didn't get the chance before becoming a casualty of lockdown.
John Douglas's Mindhunter // ...although IMO The Cases That Haunt Us has less of John Douglas blowing gold up his own culo (one thing I really liked about Mastermind was the snarking on his big-shottery). When it comes to "origins of the BSU" books, if you have to pick one?
Robert Ressler's Whoever Fights Monsters // Same story, less self-promotion -- and not that Douglas hasn't earned it, but it's not why people picked up the book either, so.

Other pioneering women of law enforcement
HBO's I'll Be Gone In The Dark // My esteemed colleague Mike Dunn and I dug Carol Daly so hard, I made us t-shirts with her picture on them.
Crazy, Not Insane // Alex Gibney's doc about forensic psychiatrist Dorothy Otnow Lewis might have slipped past you -- it came out in November 2020 -- but I thought of it very soon after starting Mastermind. A little unfocused IIRC, but it's under two hours.
American Nightmare // Misty Carausu is not so much "pioneering" as "the only l.e. figure in the doc who's worth a tinker's damn," but I'll count it.

Other serial-killer #majorcase materials
Peacock's John Wayne Gacy: Devil In Disguise // Marketed somewhat lazily; really deepened that case's story for me.
Netflix's The Sons of Sam // May illustrate the dangers of disappearing down a case rabbithole more effectively than it does the actual Son of Sam case, but I learned a lot.
Netflix's Night Stalker: The Hunt for a Serial Killer // This is a case that, overall, I don't usually "plug into," but director Tiller Russell got creative in various ways that drew me in.
Jarett Kobek's Zodiac diptych // Wild, weird, unforgettable, impossible to keep in stock at Exhibit B.; "occasionally poetic, occasionally pretentious, and pace-y and process-y as all get out."
The Deliberate Stranger // It's still not available on streaming -- this YouTube clip, the DaRonch escape scene, will give you a pretty good idea of how creepy a tone the music sets, at least -- but if you can track it down "through methods," you won't regret it. Well...you might regret it when you can't sleep later.
Optimal use of "heritage" visuals
Fear City: New York vs. the Mafia // "Guest Jeb Lund and I really liked this one: good local flavor, didn’t try to do too much, didn’t drag on longer than it needed to to seem prestige-y. Even Giuliani had something to offer besides Cryptkeeper cosplay! Maybe Mafia-based true-crime properties aren’t generally your thing, but we’re betting this one still works for you as a visual buffet of 1970s and ’80s New York City."
Get Gotti // The same creative team as on Fear City; the same smorgasbord of Carter- and Reagan-era tristate visuals.
The Beauty Queen Killer: 9 Days of Terror // Not the only reason to watch it, of course, but the way it used the vintage footage to reflect equally "vintage" victim-blaming was, I thought, quite well done.
Crime Scene: The Times Square Killer // My review noted that it came much closer than the first Elisa Lam go-round to living up to "that logline idea behind the series as a whole — that you can iris out from what happened to look at the broader influences of where it happened."
Speaking of . . . have you read this one? Sorry if I missed it. https://www.simonandschuster.com/books/The-Devil-You-Know/Gwen-Adshead/9781982134808