It's 1924 and Poppy Denby is heading up to Northumberland to celebrate her father's sixtieth birthday. She stops off in Newcastle en route to visit her Aunt Dot, who has temporarily relocated from London to renovate a house she's inherited. One of Aunt Dot's guests is the world renowned artist, Agnes Robson, who is staging an exhibition at the Laing Art Gallery. Reluctantly, Poppy is roped in to help when the artist's press liaison man falls ill. She soon discovers that the local press have dug up some dirt on Agnes relating to the tragic death of a young art teacher in Ashington Colliery, twenty-seven years earlier. As she tries to suppress the story, Poppy begins to suspect that the teacher might have been murdered and that the killer may still be on the loose.