‘The Bletchley Circle: San Francisco’ preview clip: Watch the new team in action!

Britbox has released an exclusive first look scene from The Bletchley Circle: San Francisco.

A spin-off from ITV’s hit mystery drama series, which was cancelled in 2014, the new Bletchley Circle sequel series features two of the original British lead characters.

Julie Graham and Rachael Stirling return as Jean and Millie, now in San Francisco, where they join up with two American codebreakers to investigate a string of new murder cases in four two-part standalone stories.

Watch the clip:

The official synopsis for The Bletchley Circle: San Francisco reads: “Set during the thrilling social change of the mid-1950s, The Bletchley Circle: San Francisco captures the lives of four remarkable women gifted with extraordinary intelligence, breathtaking capacity for pattern recognition, and a genius for decryption.

“Years after secretly serving during WWII as code-breakers, they turn their skills to solving murders overlooked by the police.”

The first two seasons of The Bletchley Circle are available to buy on DVD on Amazon now.

The Bletchley Circle: San Francisco begins at 9pm on Wednesday 25 July on ITV in the UK, then launches in the US on Britbox on Thursday 26 July.