Kaley Cuoco, Chris Messina star in 'Based on a True Story,' a tale of a killer idea that goes awry

In the new Peacock series “Based on a True Story,” debuting Thursday, Kaley Cuoco plays Ava, a woman obsessed with true crime. She consumes these dark stories all day, analyzes the cases with her friends and murder-centric podcasts help lull her to sleep at night.

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