River Song decides to investigate a temporal anomaly after a Luna University expedition makes some odd discoveries in an old Earth house - pages of her own diary with an inscrutable riddle written across them. However, her investigation goes badly wrong when she is transported back into the past of the house and gets trapped within its grounds. The house is the home of the Mortimers and with a limited ability to travel back and forth in time across eighty years and multiple generations, she finds herself witnessing key moments in their family history. If she wants to escape, the words in her diary are not the only riddle she has to solve. But not everyone in the house will survive what's coming. And not everyone is on her side. CAST: : Alex Kingston (River Song), Matt Addis (George Mortimer), Timothy Bentinck (Older Henry Mortimer), Isla Blair (Older Mary Mortimer), James Camp (Thomas Mortimer), Joseph Capp (Henry Mortimer), Wendy Craig (Older Maddie Mortimer), Mark Elstob (Hugo), Lillie Flynn (Maddie Mortimer), Jack Holden (Harry Mortimer), Phyllida Nash (Cook), Ronak Patani (Vinay Siddiqui), Vineeta Rishi (Carla Alcazar), Jemima Rooper (Mary Mortimer). Other parts played by members of the cast.