Should architecture be used for punishment? How might the spaces we inhabit nurture or damage us? How can we begin to start over after the worst has happened?

Criminologist Yvonne Jewkes grapples with these questions every day as the world's leading expert on rehabilitative prison design; she also faces them in her personal life when her partner of 25 years leaves her in the middle of a nightmare renovation project and then lockdown sees her trapped there.

Used to fighting the punitive prison system to create spaces that encourage reflection, healing, even hope for those incarcerated, she must learn to be similarly compassionate to herself, as she considers what might help someone at the lowest point in their life to rebuild.

There are 11.5 million prisoners worldwide, and most of them will eventually be released back into society. Yvonne asks: 'Who would you rather have living next door to you? Or sitting on the train next to your daughter? Someone who has been treated with decency in an environment that has helped to heal them and instilled hope for their future? Or someone who has effectively been caged and dehumanised for years?' Challenging our expectations of what prisons are for, she takes us along their corridors, into cells, communal spaces, visitors' areas, and staffrooms, to the architects' studios where they are designed, and even into her own home, to show us the importance of an architecture of hope in the face of despair.