Ralph Whelan and the rest of the Indian Civil Service begin the annual move to Simla where the doyenne of British society Cynthia Coffin prepares the exclusive white British Club for the summer season.

Sarah becomes suspicious of Alice's past and begins some detective work to uncover the real reasons behind her move to India.

It's the Sipi Fair in Simla, the only time in the year that the Indian community are allowed onto the grounds of the British Club.

There's much excitement in Simla as the Viceroy arrives. Ralph is troubled when he discovers that the only evidence that linked Chandru Mohan to the Congress Party is missing.

Ralph tries to take advantage of divisions among the Indian communities. Cynthia is shocked by Eugene's revelation about his finances. Sarah places Alice in a very difficult position.

The pressure continues to mount on Ralph as Jaya reveals the real reason for her visit to Simla. A mountaineer saves Alice, Madeleine and Ronnie from a perilous situation.

Simla is buzzing as it prepares for the annual amateur dramatic production, but the play is overshadowed by the news that a murder victim has been found in the river.

The British community turn out in force for the murder trial. Ian is wracked with guilt about his part in Ramu's arrest and Leena is torn apart in the witness box.

Madeleine is dealt some devastating news, and Alice is terrified when Sarah threatens to tell everyone that Alice's husband is alive. Tensions between Ralph and Cynthia escalate.

In the final episode, Ramu Sood's fate is left in Ralph's hands, a vote takes place at the club to lift the colour bar, and Alice and Aafrin prepare to go public with their relationship.

Writer Paul Rutman is joined by Julie Walters and the rest of the cast and crew to discuss the real history behind the drama, and the ambitious undertaking that brought Indian Summers to life.