A Traitor's Call

'This is the most exciting new spy series since Slow Horses: catch it now' DAILY MAIL
'One of our finest new spy writers' DAILY MIRROR
'Perfect for fans of Mick Herron, David McCloskey and Alex Gerlis' DAILY EXPRESS

THERE IS ONE CALL A SPY NEVER WANTS TO MAKE.

The SIS 'Hidden Line' - a secret number for spies in the field - rarely rings, but when it does it's always someone in deep trouble...so when a terrified call comes in, SIS goes on high alert. The voiceprint matches a former operative who...