The day after the murder: Harry and Jane are looking for some evidence. The husband of Mrs. Cooper lies dead on the wooden floor of their attic. It's clear that he was killed with a hard weapon because of his injury on his head. There is a strange water leak next to the corpse...
Flashback: Mr. Cooper went to the attic to read some old books.
Hello? Detective Harry, my husband is dead! A strange man killed him!
A strange man was hiding behind the bookshelf with a big ice cube in his Hand. The man knew, this night, he has to kill Mr. Cooper.
Mr. Cooper heard footsteps behind him but it was too late... The murderer vanished without leaving any evidences
When Mrs. Cooper came home, she found her husband and called the two detectives.
The wife of the victim was guilty. Even tho she had an alibi, she couldn't explain why she knew the murderer was a man. She started to cry and admitted the crime: She called the strange man and ordered him to kill her husband.