Sasha Wass and Jeremy Dein re-examine a seaside case of murder and mistaken identity from 1900, in a case involving false names, suspicious journeys and 100-year-old evidence. Great Yarmouth, September 1900 - a woman's body is found among the sand dunes. She had been murdered. The first mystery facing police was not identifying the killer but the woman herself - she had been staying in Great Yarmouth under an assumed name. A clue from her clothing allowed the police to name her as Mary Jane Bennett, and suspicion immediately landed on her estranged husband, Herbert Bennett. Now, over 100 years later, Herbert's great-grandson Paul is investigating the case, and he has doubts about his ancestor's guilt. Can a modern investigation shed new light on the evidence that was used to convict Herbert for murder? Sasha and Jeremy receive a breakthrough in the form of crucial physical evidence from the original investigation. Could this be the key to unlocking this mysterious case?