Bea, a resident of a retirement home, is being haunted by a ghostly nun. When Sarah Jane, Luke and Maria investigate, they're surprised to find that Bea has had just as many intergalactic adventures as Sarah Jane. But they're not the only ones who are interested in the souvenirs from her travels. What do the Sisterhood want from Bea? And what are they protecting? Based on an episode of 'Sarah Jane Adventures', this novel has colour inserts showing scenes from the BBC series.