The third girl

The famous detective Hercule Poirot is visited by a young lady who claims she may have committed murder. But then he changes his mind and leaves. The confused Poirot then learns that Miss Norma Restarick was sent to him by his friend, the writer Ariadne Oliver. When the two decide to get to the bottom of the mystery, they discover that Norma hasn't been seen for a while - and no one misses her much. Although the girl is tracked down by happy accident, she falls into deeper and deeper uncertainties about what is happening to her and around her...