The crime drama is set to return with Colin Farrell, Rachel McAdams and Vince Vaughn leading the cast, and it has now emerged that producers went to extreme lengths to keep the storyline secret.

The actors were only allowed to see the script for scenes involving their character and were instructed to learn their lines via a password-protected app which only allowed pages to be turned at the end of filming every day, according to GQ magazine.

The revelation was made in an interview with castmembers Leven Rambin and Adria Arjona, and when asked whether she would be able to reveal any tidbits from the show, Arjona replied, "(No) I'm so scared (of giving anything away)."