Showing Company Mole by Alaric Adair

Adam Cranford is a 14 year old teenager, an average schoolboy. He is also an officer in an ancient and secretive organisation called the Foundation of Honour. He has just returned home after a life threatening resuce of hostage school friends in Scotland. He should have a hero's return, but finds the police waiting to arrest him.
Soon after he discovers one of mates in school is becoming addicted to drugs. Adam decides to take on the drug gang and drive them out from the area. Little does he realise the danger this will cause to him and his family.
His official duties take him into a secret tunnel system under the City of London in England. It is in this dark place where his enemies catch up with him.