Twin sister librarians Nan and Ana plan revenge when their author mother commits suicide, with her final words suggesting her biographer murdered her.
| Actor | Role |
|---|---|
 Catrin StewartAna / Nan | Ana / Nan |
 Dyfan DwyforDan | Dan |
 Carwyn GlynGlyn | Glyn |
 Sharon MorganElena | Elena |
| RRyland TeifiEben | Eben |