When a murderer touches something, they leave behind invisible fingerprints. These fingerprints are an excellent way to find the culprit because everyone's fingerprints are different! Investigators can find fingerprints by dusting a special powder over furniture, door handles, glasses, weapons, etc.
The fingerprint of our murderer is on this glass; do you know which finger this print is from? Click on the correct fingerprint. You can make three guesses.
This is a drawing of the room where Valère Malchance was found. What did the murderer take, move or change in the room? Find the ten dissimilarities. Click on them on the top photo. The bloodstains do not count.