In fact, it was those very traits which drew Reilly to the character.
“I love her mind.
I love her intelligence.

I love her fierceness.
She’s a warrior,” Reilly said.
And while her character is quite intimidating, Reilly herself is described as just the opposite.

She has to go so far to get to Beth.
She does an amazing job.
It’s great to watch her.

She’s very intimidating as Beth, though.
I get worked up for these scenes, and then she delivers."
They both starRobert Downey Jr.as the title character and Jude Law as Dr. John Watson.

Kelly Reilly’s character, Mary Morstan, is a governess whom Watson marries.