The Eames-Erskine Case

A dead body is found in a hotel's wardrobe and points towards an unfortunate case of drug-overdose. But Inspector Pointer is not convinced and treats it as a murder mystery. Is he right in his presumption? Or, is it indeed a drug-overdose case? Excerpt: "The door opened noiselessly, and four men came in. They were in plain clothes, and one carried a large box. «Evening,» said the first. «I am Chief Inspector Pointer from New Scotland Yard. These are detectives Watts, Miller and Lester. What's wrong?» «I 'phoned,» a tall young man answered crisply. «I am the manager of the hotel. This is Mr. Beale, an American gentleman to whom this room was let a couple of hours ago. It really belongs to a young fellow who is away for the week-end, but as there was no other room available we assigned it to this gentleman for the one night. Mr. Beale has just told me that there is something wrong about the wardrobe you see there. Kindly investigate that large knot-hole in the back for yourself, Inspector.»