Craig stars as a modern-day detective on a more than usually mysterious case.
As with the rest of the cast, we don't know what role Plummer will play. But, for what it's worth, he did once play a Jack-the-Ripper-hunting Sherlock Holmes in 1979's "Murder By Decree."
Plummer last starred as billionaire J.Paul Getty in the Ridley Scott drama "All the Money in the World." At age 88, that earned him his third Oscar nomination and set a record for oldest acting nominee. He won the Best Supporting Actor Oscar for 2010's "Beginners."