A terrorist attack against the British Viceroy of India sees Aafrin Dalal left in the frame. As the Viceroy fights for his life, Aafrin finds it hard to keep his secret life as a nationalist spy from being revealed.
Aafrin's comrade Naresh believes that somebody has betrayed him. Aafrin finds it hard to contain him and he learns that the truth is darker and more dangerous than he knew, leaving the woman he loves at risk.
Aafrin is in shock following last week's hug and he is forced to play umpire in a 'friendly' game of cricket between some British and Indian politicians. His troubles increase as the Dalal family are drawn into his dangerous secret as his personal and political worlds clash.
A fashion show at the club results in a horrifying attack on one of the guests. Ralph attempts to find the culprit, but the truth is more shocking than he could have imagined and threatens to leave his political career in ruins.
A badly burned Lord Hawthorne demands Adam be arrested for the attack against him. Ralph and Cynthia try to find a way to protect the boy, when everyone's lives are thrown into chaos as a devastating earthquake strikes Simla. In the ensuing chaos, Ralph discovers a secret concerning his family history that threatens his relationship with Cynthia, while Alice finally stands up to her abusive husband.
Simla comes together to celebrate King George's Silver Jubilee but Aafrin is trapped in a nightmare. The terrorist Naresh Banerjee is plotting a bomb strike at the picnic and Aafrin needs to stop the attack, while protecting his secret life of betrayal and espionage.
The Maharajah returns to Simla, and offers Ralph his political support - at a price. Ralph is forced to consider how far he is prepared to go to achieve his ambitions as his marriage enters its darkest hour. Sarah also returns to help with the aftermath of the bombing, and her appearance prompts Cynthia to reveal a secret from her past.
Alice and Aafrin decide to flee Simla with Cynthia's help, but Charlie comes close to unveiling the truth, while Ian discovers some devastating information about Ramu Sood.
Ralph needs to deal with his darkest hour as his life begins to spiral out of control. As the announcement of the new Viceroy leaves his ambitions in tatters, he soon realises that those closest to him have been plotting behind his back.
Change is afoot in Simla as summer comes to an end. Alice and Charlie get ready to leave India for good whilst Ralph and Aafrin make some momentous decisions about their careers.