The BEST episodes of 20/20 season 40

#1 - From Classroom to Captive

Season 40 - Episode 36 - Aired 5/5/2017

Police finally track down Tennessee teacher and teen Elizabeth Thomas.

#2 - 27 Days Later: Mystery in Las Vegas

Season 40 - Episode 60 - Aired 10/27/2017

Vegas gunman's motivation remains a mystery weeks after deadly attack; Conspiracy theories emerge in Las Vegas shooting; Vegas shooting survivors say they still have nightmares, trouble sleeping

#3 - Wonder Boy

Season 40 - Episode 63 - Aired 11/17/2017

20/20 airs a very special episode that features Nathaniel Newman, a boy with the very rare cranio-facial condition Treacher Collins syndrome.

#4 - Las Vegas: Heartbreak & Heroes

Season 40 - Episode 57 - Aired 10/6/2017

Victims, eyewitnesses and first responders share their accounts of what happened during the mass shooting at the Route 91 Harvest festival.

#5 - Shark Tank on 20/20

Season 40 - Episode 28 - Aired 2/24/2017

'Shark Tank' sharks reveal their biggest deals made in the tank; The stories of 'Shark Tank' products made in America; Where these 'Shark Tank' companies are today.

#6 - ABC News Tracks Down the High Priests of Modern-Day Snake Oil

Season 40 - Episode 8 - Aired 10/28/2016

The 'Miracle Cure' That Experts Say Is Dangerous Sham; Equestrian World Duped by Woman Claiming to Be French Nobility; Workers Faking Injuries Collected Thousands of Dollars in Disability Payments.

#7 - Gretchen Carlson's Sexual Harassment Claims Against Roger Ailes

Season 40 - Episode 11 - Aired 11/18/2016

Former Fox Booker Says Ailes Sexually Harassed Her for Years; HR Expert's Advice for Handling Sexual Harassment at Work.

#8 - Stranded

Season 40 - Episode 32 - Aired 3/31/2017

What happened before woman was stranded in desert near Grand Canyon; Stranded student near Grand Canyon builds fire, sign to signal for help; Student stranded near Grand Canyon reunites with her rescuers.

#9 - The Rise, Fall and Rise of John McAfee

Season 40 - Episode 37 - Aired 5/12/2017

Anti-virus software pioneer John McAfee has been a person of interest in a murder and a presidential candidate.

#10 - Truth and Lies: Watergate

Season 40 - Episode 43 - Aired 6/16/2017

Exclusive interviews, photos and footage related to the Nixon Watergate scandal.

#11 - Diane Sawyer Investigates: ISIS in America

Season 40 - Episode 61 - Aired 11/3/2017

When former Marine discovered teen son talking to ISIS recruiters; How ISIS uses the internet to target young Americans for recruitment; The fight against ISIS's reach on America's youth

#12 - A Killing on the Cape

Season 40 - Episode 65 - Aired 11/24/2017

Accomplished fashion writer found stabbed to death at her home; Police ask men in Truro, Massachusetts for DNA samples in murder investigation; Chris McCowen shares his side of the Christa Worthington case

#13 - Justice For Holly

Season 40 - Episode 56 - Aired 9/29/2017

Brother recalls the last day he saw his sister Holly Bobo alive; Missing nursing student Holly Bobo's remains are found by ginseng hunters; Jury returns with verdict in man's trial for Holly Bobo's murder

#14 - A Chance Encounter

Season 40 - Episode 53 - Aired 9/8/2017

Arizona college party ends with a deadly shooting; Police body cameras capture aftermath of college party shooting; What college student says happened night he killed fellow NAU student; Shooting victims take stand at fellow student's trial; College student on trial for killing fellow student testifies; Jury deadlocked in trial for shooting death of Arizona college student.

#15 - Love At First Sting

Season 40 - Episode 55 - Aired 9/22/2017

Successful veterinarian finds love again with younger doctor; Woman, her boyfriend were involved in alleged murder-for-hire plot; Man awaits trial for allegedly hiring hit man to kill ex-girlfriend

#16 - Scandal & Shame in Hollywood

Season 40 - Episode 58 - Aired 10/13/2017

Interviews with women who have come out with sexual harassment claims against Hollywood mogul Harvey Weinstein; exploring whether recent allegations against powerful men will end the system of demanding sexual favors for career advancement.

#17 - The Clown Killer?

Season 40 - Episode 59 - Aired 10/20/2017

Twenty-seven years after a Florida woman was fatally shot on the doorstep of her home by an assailant in a clown costume, police arrest her husband's new wife.

#18 - Scientology: A War Without Guns

Season 40 - Episode 20 - Aired 1/6/2017

Actress Leah Remini sits down with Dan Harris to discuss her fight against the Church of Scientology during a report that includes other former members who are crusading against it, as well as those who still practice outside of the official Church.

#19 - Caitlyn Jenner - The Secrets of My Life

Season 40 - Episode 35 - Aired 4/21/2017

A Diane Sawyer Special

#20 - Leanna Taylor, The Ex-Wife of the Man Convicted In Son's Hot Car Death, Speaks Out

Season 40 - Episode 27 - Aired 2/17/2017

The horrific day Leanna Taylor found out her son was dead; Police start to suspect Justin Ross Harris after son's death; Why Leanna Taylor took the stand in ex-husband's defense.

#21 - Her Last Chance

Season 40 - Episode 5 - Aired 10/7/2016

Woman Says She Found Boyfriend's Body Covered in Blood; After 2 Trials, Woman Found Guilty of Murdering Her Boyfriend.

#22 - A Hostile Act

Season 40 - Episode 44 - Aired 6/23/2017

An international investigation into Otto Warmbier's 17-month imprisonment in North Korea, and his death, which occurred less than a week after he was brought back to the United State in a state of unresponsive wakefulness.

#23 - Dying To Be Famous: The Versace Murders

Season 40 - Episode 46 - Aired 7/7/2017

Who was Gianni Versace's killer, Andrew Cunanan; Gianni Versace is murdered in front of his Miami Beach mansion; Gianni Versace's death is mourned across the world.

#24 - Can Words Kill?

Season 40 - Episode 49 - Aired 8/4/2017

Texting suicide victim Conrad Roy's relationship with Michelle Carter; Police find Michelle Carter's text; Michelle Carter free pending appeal

#25 - Life and Limb

Season 40 - Episode 52 - Aired 8/25/2017