It's the 1960s. The height of the Cold War. The rural town of Granite Flats, Colorado, suddenly becomes a hotbed for mystery and intrigue. Almost a year after Hershel Jenkins was released from jail, mystery is still a permanent resident in Granite Flats, Colorado. From small concerns plaguing the citizens of the small town to ongoing FBI investigations, Arthur, Timmy, and Madeline are eager to put their developing detective skills to the test. Their sleuthing goes further than ever before, and they may be biting off more than they can chew. And as it turns out, sleuthing is a family affair. The parents of all three miniature detectives have dipped their toes in the water. Chief Sanders works side by side with the FBI to find a citizen who is disloyal to the country, Beth is embroiled in the center of experimental work at the hospital, and the Doctors Andrews are the masterminds behind the shady experiments. This season, everyone has got a secret and nobody is ready to admit it.
Episode 1
1962: Granite Flats, Colorado. A quiet, friendly little place...until part of the army base explodes. Is it a Soviet attack or an inside job? Who are the mysterious men in dark suits driving around town? What clandestine work is being done at the local hospital? As three young amateur sleuths and police chief investigate these mysteries, they begin to unravel a complex web of secrets, and Granite Flats will never be the same.
Episode 2
The base explosion causes a Red Scare, and Arthur and his new friends begin investigating those who may have been involved with the explosion.
Episode 3
Arthur and his friends Tim and Madeline look into the town's mysteries, and the police chief investigates one man's part in the base explosion.
Episode 4
Beth tries to connect with her son, Arthur, who has built a metal detector with his friends to help them investigate the mysteries in Granite Flats. A big city reporter begins asking questions around town.
Episode 5
Friendships are tested after a failed class project, Beth investigates Frank's strange behavior, and John struggles to balance his family and his duties as police chief.
Episode 6
Arthur and his friends look for more mysteries to solve. John, the police chief, works with the FBI.
Episode 7
Frank asks for Beth's help to prove his sanity. Hershel receives visitors while incarcerated.
Episode 8
John races to free Hershel from prison, and the kids uncover real danger after the science fair.
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