 It is because of Eddie's heroin addiction that he is termed 'The Prisoner' (the inscription above the door Roland draws Eddie from).Roland also acquires medicine for his infection during the trip to Eddie's world, but this only temporarily quells the fever.Eddie passes through the door into Roland's world, and faces heroin withdrawal symptoms, but despite his suffering, he also shows an affinity for the way of the gun—and a good deal of what Roland calls 'steel'.