A whodunit plot element is a key component of a mystery story. It typically involves a crime, such as murder, and the investigation to find the perpetrator. The four crossword solutions for this term are CLUE (4 letters), ALIBI (5 letters), MOTIVE (6 letters), Eternal Triangle (15 letters), and False Accusation (15 letters). A CLUE is an indication or piece of evidence that helps to solve the mystery. An ALIBI is an excuse or explanation for why someone was not at the scene of the crime. A MOTIVE is the reason why someone commits a crime. An eternal triangle is a situation in which three people are in a romantic relationship with each other. A false accusation is when someone is wrongly accused of a crime.