The crime scene

Sherlock led John into Mr. Burton's office.

"Mr. Burton, this is Mrs. Morstan, my good friend and associate."

John gave a curtsy to the older woman.

"Ah... name rings a bell... Your mother teaches anthropology at the university, doesn't she."

"Actually, Dr. Mary Morstan is my husband." John explained.

Sherlock began poking around the office as John had been speaking.

"This was her desk, correct?"

"Yes..." Burton said.

Sherlock lifted his dress skirt and gave the desk a mighty thwack with his foot.

A hidden door on the inside opened.

"So that's why she didn't want a partners desk." Burton said.

Inside were sealed documents. and a single card.

"this is our key to finding out what, if any, shaddy dealings she was part of and … oh no..."

"What's the matter, Sherlock?"

"Not her, anyone but her..."