1. Problem
1.1. Murder
1.1.1. Murderer
1.1.2. body
1.1.3. to murder
1.2. Robbery
1.2.1. Robber /thief
1.2.2. to steal
1.3. Bomb attack
1.3.1. Terrorist
1.3.1.1. Bomb
1.3.2. to plot
1.4. Weapon
1.4.1. gun
1.4.2. knife
1.4.3. rope
1.4.4. poison
1.4.5. stone
1.4.6. syringe
1.5. Motive
1.5.1. love
1.5.2. deception
1.5.3. money
1.5.4. jealousy
1.6. Who/what/where/when/what time
1.7. Clues
1.7.1. autopsy
1.7.2. fingerprint
1.7.3. Footprint
1.7.4. hair
1.7.5. Objects
2. Action
2.1. Collects
2.1.1. Evidence
2.1.2. Clues
2.1.3. information
2.1.4. motives
2.2. Searches
2.3. Succeeds
2.4. Solves the mystery
2.5. Concludes
2.6. Arrests
2.6.1. murderer
2.6.2. thief / thieves
2.6.3. culprit
3. Expert
3.1. Knowledge
3.2. Experience
3.2.1. Experienced
3.3. Science
3.3.1. Scientific
3.4. Intelligence
3.4.1. intelligent
4. Ideas
4.1. Investigation
4.1.1. Clue
4.1.1.1. Footprint
4.1.1.2. Fingerprint
4.1.1.3. Blood
4.1.2. Suspect
4.1.2.1. Guilty
4.1.2.1.1. Prison
4.1.2.1.2. Lies
4.1.2.2. Innocent
4.1.2.2.1. Free
4.1.2.2.2. Tells the truth
4.1.2.3. to suspect
4.1.3. To investigate
4.2. Supposition
4.2.1. To suppose
4.3. Comparison
4.3.1. To compare
4.4. To notice
4.4.1. To deduce
4.5. Feelings
4.5.1. to feel
4.5.2. intuition
4.5.3. sight
4.5.4. smell
4.5.5. touch
5. Famous detectives
5.1. Writers
5.1.1. Castle
5.2. Forensic doctors
5.2.1. Abby Sciuto (NCIS)
5.2.2. Temperance Brenan (Bones)
5.3. Police officers
5.3.1. Commissaire Maigret
5.3.2. Inspector Columbo
5.4. Ordinary people
5.4.1. Miss Marple
5.5. Private detectives
5.5.1. Hercue Poirot
5.5.2. Sherlock Holmes