Rachel McAdams joins 'Sherlock Holmes'

Starring opposite Robert Downey Jr. in Guy Ritchie film

Rachel McAdams will star opposite Robert Downey Jr. in "Sherlock Holmes," a reimagining of Sir Arthur Conan Doyle's supersleuth that Guy Ritchie is directing for Warner Bros. and Village Roadshow.

The movie, which will begin shooting next month, takes its cue from a forthcoming comic book that producer Lionel Wigram wrote as a selling tool for a new take on the classic character. The concept sees Holmes as more adventurous and less stuffy than previous screen incarnations and mines more obscure character traits.

Downey will play Holmes while Mark Strong ("RocknRolla") plays the main villain, Blackwood. Jude Law is portraying Holmes' colleague Watson.

McAdams plays Holmes' enigmatic love interest, Irene Adler, a character who appeared in Doyle's 1891 "A Scandal in Bohemia." While the character only appeared in that one story, McAdams' personage would return for any possible sequel.

Producing the film are Joel Silver, Wigram, Susan Downey and Dan Lin.

Jon Berg, Ollie Madden and Elishia Holmes are overseeing for Warner.

McAdams, repped by UTA and Shelley Browning of Magnolia Entertainment, stars in "State of Play" with Ben Affleck and Russell Crowe, which is due in theaters in April, as well as "The Time Traveler's Wife," which will be released in fall 2009.