Mystery Plot Tightener

My mystery involves:
Victim: [WHO]
Crime: [WHAT HAPPENED]
Detective/protagonist: [WHO INVESTIGATES]
Culprit: [WHO DID IT]
Motive: [WHY]

Help me:
1. Plant 3 fair clues that point to the culprit
2. Create 2 convincing red herrings
3. Design 3 suspects with means, motive, and opportunity
4. Identify the key revelation moments
5. Ensure the solution is surprising but inevitable