The performances are brilliant, showing both the reality of prison life and the slow build from attraction to friendship to impossible love between Kevin Jones (Jackman) and Louisa Correlli (Furness). They have relatively little screen-time together in many of the episodes but the connection between them is electrifying.
Jones is a flawed hero, a loner (at least initially) and repeat offender who is often bitter and angry or even savage but there is a added depth to him that makes it easy to understand Correlli's compulsion to reach out to the good heart that lies beneath his pain and sometimes shines through unexpectedly.
The supporting cast are also excellent, giving the leads strong characters to play off and mostly avoiding the pitfalls of two-dimensional caricatures of prisoners and guards. Prison life is starkly portrayed, showing the hope and despair that the inmates feel and the bonds of friendship or enmity that can form between them.