Black Cat Reading & Training Step Five B2.2: the Problem of Cell 13 + Audio Cd

‘Lock me in any cell in any prison anywhere at any time, wearing only normal clothes and I’ll escape in a week.’ For Professor Van Dusen, otherwise known as ‘The Thinking Machine’, nothing is impossible. Logic is his passion. One hour later he finds himself locked up in Chisholm prison and has to use all his mental resources to find the solution to the problem.