“It’s sad to be saying goodbye to Abby and Zara, but after three series, we felt that the story of Graceless was coming to a natural end,” says producer Mark Wright. “It’s been such a happy creative time working with Simon, Lisa, Ciara and Laura over the last few years, and I think that the scripts Simon has come up with for this last series really do the characters justice. And it’s been a real privilege to work with a fantastic guest cast, and to welcome back some old friends to the series for the final episode.”

Part one, The Edge, resolves the series two cliffhanger, which saw Abby and Zara lost in the vortex, with Abby washing up at a strange hotel on the edge of a cliff in search of Zara. But will she want to be found? Tim Bentinck and Sunny Ormonde – better known as David Archer and Lillian Bellamy in BBC Radio 4 soap opera The Archers – guest star as Albert and Miss Simone, along with Joe Coen as Kurt and Paul Copley as Dennis. Joe recently appeared in the TV mini series The Bible, and for Big Finish has recorded the Doctor Who audios The Elite and Binary. Paul Copley’s extensive CV includes The Lakes, Downton Abbey, the Bafta-winning Last Tango in Halifax, as well as the acclaimed Big Finish Doctor Who audio Spare Parts.

Part two, The Battle, takes Abby and Zara to the Battle of Maldon in 10th century Britain, where they discover the true consequences of their actions throughout space and time. Can they convince a historian in the far future to help them put things right? Critically acclaimed actress Geraldine James guest stars in The Battle as Chi. Amongst her many credits, Geraldine has starred in TV drama Band of Gold, as Mrs Hudson in the Sherlock Holmes films with Robert Downey Jr, and most recently in Channel 4’s Utopia. Tim Chipping (Troy and the Big Finish Companion Chronicle The Wanderer) joins the cast as Burtnoth, with Joe Coen as Olaf.

With a universe and history against them, Abby and Zara find they have nowhere else to go – apart from the one place they nearly called home. But what will they find there on the day they choose to die? Consequences, the final episode of Graceless, sees the return of Michael Cochrane and Joanna Van Gyseghem reprising the roles of Brondle and Wing, first seen in series two’s The Flood. They are joined by another old friend to the series in Fraser James, who once again plays Marek – but is it a Marek that Abby and Zara will recognise?

“Lisa Bowerman has assembled such a brilliant guest cast for this third series,” says Mark, “and to be able to welcome back Michael, Joanna and Fraser for the final episode was the icing on the cake. We’ve loved every second of making Graceless over the years, and we hope our listeners enjoy the finale as much as we’ve enjoyed making it.”

Graceless III is available to pre-order now as a three-disc CD box set for the special pre-order price of £22, or as a digital download for £17.