The laser-like intent of her gaze is something Mycroft has seen before, but only on his brother or in a mirror. What he's never seen is the speed with which hers disintegrates and is replaced with something as unremarkable as a casual smile. Going from intense concentration to a manic grin—something fierce, triumphant—yes, he's witnessed that transformation many times in Sherlock. This is different.

The law of the conservation of energy states that energy cannot just disappear, yet that is what this woman seems to have accomplished. It's unnerving.

"As others have been so determined to remind me, I've only recently arrived, and so I'm afraid I don't do much of anything at the moment," Mycroft says, scanning her notes on the table with interest. If this is about the Network, he'll learn all he can before he leaves.