Beyond the archway separating the stairways, the floor plan gave evidence of hesitation. Indicating, she guessed, some awkwardness inherent in the halving of the building’s original purpose. She pressed a worn but regularly polished brass button, to call down the oldest elevator she’d ever seen, even in London. The size of a small, shallow closet, wider than it was deep, it took its time, descending its elongated cage of black-enameled steel.