It is written and directed by Stephen Poliakoff, starring Jim Sturgess, Freddie Highmore, Charlotte Riley, Phoebe Fox, Alfred Molina, Ciara Charteris, Lindsay Duncan, August Diehl, Alfie Allen, Angela Bassett, Antje Traue, Lucy Ward, Sebastian Armesto, Julian Bleach, Charity Wakefield, Aleksandar Jovanovic, and Robert Glenister.
Just after World War II ends, Dieter Koehler, a German engineer who specialised in jet aeroplane technology, is seized along with his young daughter Lotte by T-Force.
They are taken to Great Britain and detained, where Captain Callum Ferguson is assigned the task of getting Koehler to co-operate with the British government.
The Stephen Poliakoff-created seven-part series was announced by BBC Two in March 2015, along with an all-star cast consisting of Jim Sturgess, Freddie Highmore, Charlotte Riley, Phoebe Fox, Alfred Molina, Lindsay Duncan, Robert Glenister, August Diehl, Antje Traue, Angela Bassett and Alfie Allen.
[3] Principal photography began in Liverpool in March 2015 with Martins Bank Building, Croxteth Hall, the Adelphi Hotel being amongst some of the locations utilised.