Monarch of the Glen (2000)

Season 1: Episode 3

Jealousies run high when Archie's girlfriend and business partner, Justine travels up from London to see what's holding Archie up. It seems she feels he has developed too much of a soft spot for local girl Katrina. She also stumbles on a locked room at the estate which apparently belonged to Archie's brother who drowned when they were teenagers. The Glenbogle ball proves to be the scene of the Justine/Katrina showdown.