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In this week's episode of "The Fosters" (9 p.m., Freeform), Callie does volunteer work at Girls United, where one resident hides a dangerous secret. And Ana sends Stef a troubling letter.

The 2016 Summer Games are still in high gear. For Olympics highlights, click here.

There are a few shows airing original episodes tonight — but only a few.

• "Bachelor in Paradise" (7 p.m., ABC/Ch. 4): The unattached guys try to bring their A-game to the cocktail party so they won't be sent home.

• "Rizzoli & Isles" (7 and 9 p.m., TNT): A forensic accountant is shot, luring Jane and Maura into a byzantine Ponzi scheme.

• "Major Crimes" (8 and 10 p.m., TNT): The team investigates when a young actor overdoses.

• "Mistresses" (9 p.m., ABC/Ch. 4): April's mother interferes in her relationship with Marc.

• "Guilt" (10 p.m., Freeform): As the trial begins, Natalie and Det. Bruno seek new evidence to prove Grace's innocence.