The Spy Thief: Ben Sign Mystery, Book 5 (Unabridged‪)‬

The most vital secrets of Great Britain are being stolen and sold to hostile foreign agencies. The perpetrator is an ingenious and ruthless high-ranking British official, code name "The Thief". The identity of the traitor is unknown, but it is established he is one of five suspects.

Brilliant strategist and former MI6 spy Ben Sign is discretely commissioned to investigate the security breach and neutralize The Thief. In trying to solve the mystery, Sign realizes he is facing the most formidable opponent he has ever encountered.