The untold story of Katherine G. Johnson, Dorothy Vaughan and Mary Jackson – brilliant African-American women working at NASA and serving as the brains behind one of the greatest operations in history – the launch of astronaut John Glenn into orbit. The visionary trio crossed all gender and race lines to inspire generations to dream big.

本季共4集，每两集一个案子。
Hattie Morahan饰演的Alice曾经也是布莱切利的一员，现在她面临谋杀的指控，马上要面临绞刑，Jean找回Susan、Millie和Lucy帮助Alice洗清罪名，却揭开了更深的内幕。
Susan离开英国前往印度，开始全新的生活，Millie却因为做黑市交易陷入了巨大的麻烦，甚至会有性命之忧……