In 'Unforgettable' (Tue., 10PM ET on CBS), Poppy Montgomery plays Carrie Wells, an investigator suffering from hyperthymesia, which is the ability to remember the details of every single day of her life.

In the series premiere Carrie uses this special gift to look over a crime scene and finds something she didn't notice before.

Replaying events in her mind's eye, she sees a shadow on the wall, which indicates that a man was hiding close to where a woman was killed. This then leads her to inspect a drain opening nearby.

After digging around under leaves, Carrie pulls out a large bloodstained knife. Has her special ability just led her straight to the murder weapon?