The chemistry between Downey Jr. and Law drives the film, transforming the detective story into a buddy comedy. By focusing on their codependency, the film highlights a tragic character flaw in Holmes: his inability to function alone. The plot of the film—a supernatural conspiracy involving Lord Blackwood—is arguably secondary to the emotional plot of Holmes trying to sabotage Watson’s engagement to Mary Morstan. This character-centric focus grounds the blockbuster spectacle in something relatable and humorous, proving that the intellect needs a heart to survive.
: Holmes is depicted using various "tonics" and chemicals, and Watson is often seen drinking or smoking a pipe. Common Sense Media Production & Technical Stats Box Office Success : It was a major hit, grossing over $524 million worldwide and ranking as the 8th highest-grossing film of 2009. Visual Style index of sherlock holmes 2009