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A teenager goes missing after a night of revelry in “The Disappearance,” a sudsy French thriller with hints of “The Missing” and “Broadchurch.” The Olympic sprinter Allyson Felix chases her seventh medal. And survivors of the Orlando, Fla., massacre talk about life after the attack.

THE DISAPPEARANCE on Acorn TV. A teenager (Camille Razat) in Lyon, vanishes after a night celebrating her birthday with friends, and suddenly everyone is a suspect in this French thriller. But how well do her parents (Alix Poisson and Pierre-François Martin-Laval) actually know their child? (How well does any parent?) With plenty of twists, turns and red herrings, this eight-part import is reminiscent of other missing-child mysteries like “The Missing,” “The Killing” and “Broadchurch.” The flourishes will be familiar, Mike Hale wrote in The New York Times, but “fans of police procedurals who make it through three or four episodes will want to stick around to find out who done it.”

THE MISSING on Starz Play. A 5-year-old British boy vanishes during a family vacation in France, sending his parents (James Nesbitt and Frances O’Connor) on a yearslong search to find out what happened to him. Tcheky Karyo plays the French detective who initially leads the investigation, then comes out of retirement when a clue emerges eight years later; Jason Flemyng is the police representative on the British side; and Arsher Ali is the aspiring journalist merciless in his quest for a scoop. In The New York Times, Alessandra Stanley called this mini-series “imaginatively written, well cast, chillingly believable and quite addictive.”

MARIE ANTOINETTE (2006) 5:50 p.m. on Starz Cinema. Sofia Coppola drew upon Antonia Fraser’s biography and then wove a postpunk score and a high-top sneaker into this drama about Marie Antoinette, the ill-fated young French queen, portrayed by Kirsten Dunst. It’s “a thoroughly modern confection, blending insouciance and sophistication, heartfelt longing and self-conscious posing with the guileless self-assurance of a great pop song,” A. O. Scott wrote in The Times.

RIO OLYMPICS 8 p.m. on NBC. Allyson Felix tries to win her seventh medal, becoming the most decorated American woman in track and field, as she competes in the 400-meter final. And the gymnast Simone Biles, the all-around gold medalist, competes on the balance beam in the apparatus final. A complete schedule is at NBCOlympics.com.

TRUE LIFE: WE ARE ORLANDO 8 p.m. on MTV. Survivors of the Pulse nightclub massacre in Orlando, Fla., discuss life after the attack. One, for the first time since the tragedy, meets the man whose life he helped save. The episode, which will be available free on MTV.com, MTV On Demand and iTunes, will also address resources for people dealing with trauma, anti-L.G.B.T. bias and gun violence. Information can be found at orlando.electthis.com.

WILD REEDS (1995) 11 p.m. on TV5Monde. François (Gaël Morel), a sensitive boarding school student in the South of France during the Algerian War, falls in love with his classmate Serge (Stéphan Rideau), a peasant boy. But it’s François’s best friend, Maïté (Élodie Bouchez), whom Serge really wants to be with in André Téchiné’s César Award winner for best film, director and original screenplay. In French with English subtitles.

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What’s on TV Monday: ‘The Disappearance’ and ‘True Life: We Are Orlando’