As a rule, in any investigation, there will always be something you’ve forgotten or don’t know everything about. That is why an open-minded and critical friend, like Dr Watson in the Sherlock Holmes stories, is so indispensable. As Holmes said: ‘You have a grand gift of silence, Watson. It makes you quite invaluable as a companion.’ Remember that evidence, new perspectives or insights can be found where you least expect them. That’s why all expert detectives should demonstrate empathy, be humble, ask questions, and develop their listening skills. Investigative interviewing is done by gently holding back your own opinion, asking open-ended questions, and using silence and active listening techniques such as nodding and humming. This extends to listening to your devil’s advocate. Receptivity to alternative views is a crucial skill not only for detectives but for any decision-maker in the modern era. In a world where complexity increases constantly, there’s no room for lone wolves.