A psychological horror story set in rural Wales amid the mysterious world of mycelium.

When social worker Cassie discovers mould in the flat of a vulnerable service user she puts it down to poor quality housing. But then she discovers it in her own house and begins to fear for the safety of her family.

For partner Morgan and young son Bryn, it’s not the mould that troubles them but Cassie’s mental health. As the fungus continues to grow and spread, Cassie resorts to more extreme measures to combat it. But why will no one listen to her when she warns of danger? With Hywel’s help Cassie begins to find answers. But they are not the ones she wanted.

In Greek mythology, Cassandra was condemned to speak the truth yet never be believed. A story of trust and what happens when we lose it. And of a hidden threat attacking the very thing that makes us powerful.

Written and created by Marietta Kirkbride

Cassie …… Kate O’Flynn
Interviewer ….. Laurel Lefkow
Hywel ….. Lloyd Meredith
Morgan…… Owain Gwynn
Bryn …… Macsen Ovens
Joyce ….. Kezrena James
Ola …… Aggy K. Adams
Theo …… Richard Corgan
Young Helen …… Lily Anne Lefkow

Other voices played by the cast

Production Manager: Anna de Wolff Evans
Production Assistant: Teresa Milewski
Executive Producer: Sara Davies

Title Music: Ioana Selaru & Melo-Zed
Sound Design: Jon Nicholls

Directed and Produced by Nicolas Jackson

An Afonica production for BBC Radio 4