The Murder Occurs

Jane Rosario returns from a normal day at work. She was the only person at the railway crossing as she had returned early because she was not feeling very well. The Train to San Francisco was about to pass. As the train went past with great speed, Jane stares from her car with utter horror as she sees a woman stabbed in the 4th compartment.
But no body was found.........
Who would believe poor Jane? They would just say.....as she was already unwell she would have imagined the whole thing...
But when Miss Hannah Wetherby is reported missing and that she had been travelling in the train at 4 in the evening to San Francisco, everything changes..............