The Final Cipher

One last code. One final choice.

Rumours say Lionel Gage is dead. The truth is far more dangerous.

When Maya Dalton receives a mysterious thumb drive labelled 'THE FINAL CIPHER, ' she and Alex are thrust back into the shadows of their past. The file is tied to 'Nightfall, ' the off-books MI5 programme that trained Alex Rennie-and it reveals a chilling truth: 'Nightfall' never ended. It evolved. Their search leads to a forgotten Cold War island turned digital fortress, run by 'The Architects,...