One away...'' is the traditional cry of warders on Dartmoor. Tam Bass heard it as he lay in the grass. To carry out the intricate plan for his escape Tam had to run - and run to a pre-arranged rendevous on the other side of the moor.

But as his brothers Ruben and Peter flashed past the meeting point on their motorbikes, there were already signs that something was wrong - that the Bass brothers had started a dreadful chain of events that they were now powerless to stop...