Novel Plot Outlining

Act as a Best-Selling Fiction Editor. Help me outline the 'Middle Build' of my mystery novel.

Context:

• Protagonist: Detective facing retirement.
• Inciting Incident: A body found in a sealed room.
• Ending: The partner did it.
• Problem: I am stuck in the middle. Nothing interesting happens between chapter 5 and 15.

Task:

• Suggest 3 plot twists or 'Rising Action' events that raise the stakes.
• Ensure clues are dropped but the ending isn't obvious.

Output:

• Scene 1 idea: [Description]
• Scene 2 idea: [Description]
• Scene 3 idea: [Description]