In the classic abolitionist text, Prison on Trial, Thomas Mathieson argues that imprisonment cannot be justified by appeal to any standard punitive aim: rehabilitation, deterrence, incapacitation, or retribution. The aim of this paper is to give prison an ‘appeal hearing’: to examine whether it can be justified by a set of punitive aims not considered by Mathieson. In particular, it asks whether imprisonment can be justified by the ‘communicative’ theory of punishment proposed by Antony Duff. Duff sees imprisonment as having (...) an important role in a properly ‘communicative’ system of criminal justice: to serve as the ultimate sanction for offenders who fail to comply with other forms of punishment; to shock offenders into repentance for their crimes; and to communicate to offenders in a symbolically appropriate way the seriousness of their offence. This paper argues that each of Duff’s rationales fails: using prison as an ultimate sanction violates the communicative principle of treating offenders as responsible moral agents; the evidence suggests that prison will impede rather than facilitate repentant understanding; and while prison might be able to express censure, it is not rationally connected to enabling a meaningful moral dialogue. As such, it concludes that this particular appeal hearing for imprisonment fails. (shrink)