It has often been said that the more unusual the murder the easier it is to solve, but this is a theory I don't believe. Nothing is easy, nothing is simple, and you should think of your investigations as a complicated experiment: look at what remains constant and look at what changes, ask the right questions and don't be afraid of wrong answers, and above all rely on observation and rely on experience.
Peter Ackroyd, Hawksmoor
detection, detective, investigation, murder