War is inevitable, and so it seems is the realization that the secrets of 165 Eaton Place are about to come to light. Lady Agnes returns home determined to heal the rift in her marriage. She soon comes to understand that she doesn't know half of what has been happening in her household – upstairs or down. Sir Hallam is also intent on making amends and does all in his power to rectify his personal and professional mistakes.
Downstairs, Harry and Beryl face a ticking clock to get their affairs in order. Mr. Pritchard, after his behavior the previous evening, leaves Eaton Place in shame. Johnny is left to run the household, and soon, everything is thrown into chaos compelling Johnny to seek counsel from a familiar face from the past.
As war seems closer and closer, it is becoming painfully clear to the entire household that the clock can’t be turned back, and that the time has arrived for the greatest test in the history of 165 Eaton Place.