deductiona conclusion reached based on reasoning or information
Definitions:
the inference of particular instances by reference to a general law or principle"Sherlock Holmes used deduction to solve crimes."
mysterysomething difficult or impossible to understand or explain
Definitions:
something that is difficult or impossible to understand or explain"The mystery of the Bermuda Triangle has been a topic of interest for many."
a novel, play, or film dealing with a puzzling crime, especially a murder"She enjoys reading mystery novels."
cluea piece of evidence or information used in the detection of a crime or solving of a mystery
Definitions:
a piece of evidence or information used in the detection of a crime"Holmes found a clue at the crime scene, a strand of hair."
a fact or idea that serves as a guide or aid in a task or problem"He used her diary as a clue to understand her thoughts."