When Joyce Hetherington loses her half-sister in a tragic and mysterious railway accident, she calls on her old school friend, Greg Mason, to investigate. Greg has recently begun his own private detective agency and, together, the two uncover secret after secret about her past and the strange set of circumstances surrounding Helen's death, including details about the inheritance that she was set to receive from her grandmother - an inheritance that was granted instead to an unknown beneficiary. As they sink deeper and deeper into the case, Greg and Joyce begin to realise that not everything...