Dr. Alex Hart deciphers an ancient manuscript, only to realize it contains a hidden code leading to a dangerous conspiracy. Teaming up with rogue hacker Maya King, Alex finds himself hunted by a group known as The Cipher Society, whose members are willing to kill to keep their secrets safe. As they race through London's underground and historic sites, Alex and Maya must crack a series of increasingly complex ciphers to expose the truth before The Cipher Society silences them forever.