After the weekend party at Brownstone Mansion, Alison Brown discovered that her husband Henry had been murdered in the secret library. Alison immediately contacted the famous detective Sherlock Johnson to investigate the case.

Sherlock began verifying the alibis of each person.

Alison: "I went to bed early after the party because I was tired. I didn't know Henry was in the library."

Matt: "I was talking with Alison and after she went to her room, I stayed in the library. I had an important conversation with Henry."

James: "After the party, I was busy tidying up the house. I had no reason to go near the library."

Clues

Sherlock found important clues while investigating the scene.

• The Library Door: The library door was not forced open and was not locked.
• The Library: Henry's documents were scattered in the library, indicating he had been working there all night. An ink bottle was found knocked over, with ink spilled on the floor.
• The Living Room: Matt's wine glass was found in the living room, with his fingerprints on it.
• Footprints: Several footprints were found near the library, including ones matching James's shoes.
• Mysterious Documents: Some of Henry's documents found in the library relate to financial problems, but one document suggests an older issue.
• Phone Records: Matt made several phone calls during the party. It is unclear who he was talking to.
• Party Invitations: Some of the party invitations were written in James's handwriting, and some were never sent. This suggests he may have tried to control the guest list.
• Fingerprints: Fingerprints found on the library door handle matched Henry's, but James's fingerprints were also found.
• Secret Safe: The secret safe in the library showed no signs of tampering, but it had been accessed frequently over the past few weeks.
• Security Footage: The security footage shows a shadowy figure entering the library, but the image is too blurry to identify.
• Financial Records: Henry's financial records show large sums of money transferred to an unknown account over the past month.
• Wine Stains: Wine stains found near the library suggest someone might have been drinking there, contradicting Henry's statement.
• Broken Lock: The lock on the back door was found broken, suggesting a possible external entry.
• Bloodstains: Bloodstains found in the library were confirmed to be Henry's, with blood spread across the desk and floor.