This back stair goes from top to bottom of the building, from
the end of the same hallway as the main stair."
"There is na either way out but by the front door?"
"No."
"Then if the evidence o' the Spinker man is above suspeecion, Mrs.
Irvin and this Kazmah were still on the premises when ye arrived?"
"Exactly. I gathered that much at Vine Street before I went on to Bond
Street. The whole block was surrounded five minutes after my arrival,
and it still is."
"What ither offices are in this passage?"
"None. It's a blank wall on the left, and one door on the right--the
one opening into the Kazmah office. There are other premises on the
same floor, but they are across the landing."
"What premises?"
"A solicitor and a commission agent."
"The floor below?"
"It's all occupied by a modiste, Renan."
"The top floor?"
"Cubanis Cigarette Company, a servants' and an electrician."
"Nae more?"
"No more."
"Where does yon back stair open on the topmaist floor?"
"In a corridor similar to that alongside Kazmah's. It has two windows
on the right overlooking a narrow roof and the top of the arcade, and
on the left is the Cubanis Cigarette Company. The other offices are
across the landing."
Mary Kerry stared into space awhile.
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