Action adventure film Sherlock Holmes: A Game of Shadows led a trio of sequels at the US box office over the weekend with $40m in ticket sales, according to studio estimates compiled yesterday. The sequel to 2009’s Sherlock Holmes starring Robert Downey Jr. beat Alvin and the Chipmunks: Chipwrecked, the third film in the popular family franchise. Chipwrecked pulled in $23.5m from Friday through to Sunday. Mission: Impossible - Ghost Protocol, the fourth movie in the action series starring Tom Cruise, was in third place with $13m at just 425 theaters over three days. Sherlock Holmes and Chipwrecked played in more than 3,700 theaters each.