On Easter Sunday 1915 - the day after her seventh birthday - Maggie Nally was brutally raped and murdered, her body dumped in the ladies' lavatory at a London Tube Station. Maggie's murder remains unsolved, as do three other child murders from the same period. Were these terrible and tragic killings connected? Were Maggie, Marie, Winnie and Willie murdered by the same hand? Was there a serial killer at large in the vicinity of what is now the A501? This is Maggie's story...