When a body is discovered in a derelict building, DCI Cassie Stuart must untangle lies that have been covered up for nearly forty years. With her partner, DI Sunil Sunny Khan they narrow the list to four suspects, each with something to hide. As their deceptions are discovered, the people they love most begin to wonder what else they might be capable of.

A new person in charge of security rubs John the wrong way and he worries that she may put the whole job at risk. Everyone tries to remain calm as the big day gets closer; savoring their old lives for the last time before things change forever.

Planning for the heist is coming together but the men's lives aren't getting any easier. Chris's mom is getting worse. Marcus is under pressure from Gina to assert himself more. Meanwhile, John tests the guns and enjoys his new found confidence.

Celia and Alan rediscover a relationship that started 60 years ago.

Caroline and Gillian become unexpectedly close when Alan and Celia go missing.

Celia and Alan's search for a wedding venue leaves them trapped in a haunted mansion.