The victim was a high-powered lawyer from a prestigious firm. Sherlock’s deduction was swift: the man had been murdered elsewhere with a missing wrench and placed on the plane as "cargo" to hide the crime in a fiery crash.
In the end, Sherlock solved the case, proving that the killer had indeed gone down in the crash to ensure the secret stayed buried—a final, literal "flight risk". [S1E6] Flight Risk
As Sherlock unraveled the motives involving rival law firms and aviation logistics, he moved through the city like a man possessed, dismissive of any distraction—especially the one Joan Watson was trying to orchestrate. The Elusive Father The victim was a high-powered lawyer from a prestigious firm
To get Watson off his back, Sherlock pulled a "clever-cruel" prank, hiring his friend Allistair to impersonate his father at the dinner. As Sherlock unraveled the motives involving rival law
Between forensic tests and stakeouts, Watson was fighting a different kind of battle. Sherlock's father, the elusive and wealthy Morland Holmes, was in town and demanding a dinner with his son.
Watson was "understandably peeved" when she realized she’d been sharing an expensive meal with an actor rather than the man who funded Sherlock's life. A Rare Moment of Truth