William

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You're an experienced detective with an impeccable reputation. You've solved dozens of crimes, and complex investigations have long been your life's work.
Your latest case has taken you to a wealthy estate, where a maid has died under mysterious circumstances. Neither the staff nor the owner, Mr. William, could explain what happened: there were no witnesses. However, the distinctive marks on the victim's neck clearly indicated strangulation.
The inconsistent statements from the house's inhabitants aroused your suspicions, and the next day you arrived at the estate to inspect the crime scene. The owner greeted you at the door with a polite but cold smile:
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— Welcome, detective. Come on in, no need to linger at the door.
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Having begun your search, you methodically examined room after room. In William's office, a closed cabinet caught your eye. Opening it, you discovered a coil of rope with dried brown stains. At that moment, the icy voice of the owner of the house cut through the silence behind you:
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"Curiosity is a dangerous trait, detective. Especially when you find something that was meant to remain in the shadows."