When a strange child follows her home on the train from London, Ella Bridges feels bound to help her. However she soon discovers the child is not what she seems. Having recently moved into a large home on Linhay Island, affectionately known locally as The Yellow Cottage, Ella finds herself at the center of a murder investigation thanks to a special gift from the previous house owner. Along with her unusual sidekick, a former cottage resident, Ella follows clues which take her to the heart of London. As the mystery unravels, she is forced to enter the lion's den to solve the crime and stop the perpetrator. But can she do it before she becomes the next victim?