Who has time to solve a crime when your past is knocking on the door?

If you loved the amateur sleuths of The Thursday Murder Club, meet the Greybridge Sleuth Circle—ready to trade bridge night for a Cold War conspiracy.

It's been a slow season for the Greybridge Sleuth Circle. No bodies, no headlines, just weekly bridge nights and the occasional argument over crossword clues. Marla is knee-deep in estate paperwork after her brother's death. Theo's rekindling an old flame he probably shouldn't. Edwin is learning to meditate (badly), and Cassandra—retired profiler turned birdwatcher—claims she's enjoying the peace.

But when a stranger named Garrett shows up at Marla's door, clutching a torn journal and asking questions about a decades-old disappearance, everything shifts. Hours later, he's gone—and so is the journal.

As the group digs into Garrett's last known moves, they uncover a trail of forged documents, a hidden vault, and whispers of a missing government ledger tied to a Cold War operation no one will admit existed. Every clue leads to more questions—and to more danger.

When someone close to the group is attacked, the sleuths realize this isn't just a missing person case—it's a warning. They're up against someone who's killed to keep the past buried.

Time is running out. And some secrets are designed to stay hidden.