1. Expert
1.1. Knowledge
1.2. Experience
1.2.1. Experienced
1.3. Science
1.3.1. Scientific
1.4. Intelligence
1.4.1. intelligent
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. Ideas
3.1. Investigation
3.1.1. Clue
3.1.1.1. Footprint
3.1.1.2. Fingerprint
3.1.1.3. Blood
3.1.2. Suspect
3.1.2.1. Guilty
3.1.2.1.1. Prison
3.1.2.1.2. Lies
3.1.2.2. Innocent
3.1.2.2.1. Free
3.1.2.2.2. Tells the truth
3.1.2.3. to suspect
3.1.3. To investigate
3.2. Supposition
3.2.1. To suppose
3.3. Comparison
3.3.1. To compare
3.4. To notice
3.4.1. To deduce
3.5. Feelings
3.5.1. to feel
3.5.2. intuition
3.5.3. sight
3.5.4. smell
3.5.5. touch
4. Famous detectives
4.1. Writers
4.1.1. Castle
4.2. Forensic doctors
4.2.1. Abby Sciuto (NCIS)
4.2.2. Temperance Brenan (Bones)
4.3. Police officers
4.3.1. Commissaire Maigret
4.3.2. Inspector Columbo
4.4. Ordinary people
4.4.1. Miss Marple
4.5. Private detectives
4.5.1. Hercue Poirot
4.5.2. Sherlock Holmes
5. Tools of the trade
5.1. a magnifying glass
5.2. handcuffs
5.3. binoculars
5.4. gun
5.5. handcuffs
5.6. a computer
5.7. a notebook
5.8. gloves
5.9. a flash light
5.10. a paint brush
6. Problem
6.1. Murder
6.1.1. Murderer
6.1.2. body
6.1.3. to murder
6.2. Robbery
6.2.1. Robber /thief
6.2.2. to steal
6.3. Bomb attack
6.3.1. Terrorist
6.3.1.1. Bomb
6.3.2. to plot
6.4. Weapon
6.4.1. gun
6.4.2. knife
6.4.3. rope
6.4.4. poison
6.4.5. stone
6.4.6. syringe
6.5. Motive
6.5.1. love
6.5.2. deception
6.5.3. money
6.5.4. jealousy
6.6. Who/what/where/when/what time
6.7. Clues
6.7.1. autopsy
6.7.2. fingerprint
6.7.3. Footprint
6.7.4. hair
6.7.5. Objects