Hand of Justice
Solve a Murder Mystery.

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Murder mysteries are marked on the map with a magnifying glass symbol. The very first one can be found in northern Paris. Go to the map marker, and you will reach a police station. The officer will tell you that if you solve murder cases for him, he will give you weapons and equipment. Once you are done speaking to him, talk to the man in the jail cell. You will now get given a murder case to solve. I had the "Murder Foretold" mystery. Now all you have to do is go to the location marked on the map and investigate the body. You can now use eagle vision to scan for clues, and also ask people in the area if they saw anything etc. Once you have found most of the clues, it will give you the option to accuse somebody. You will see markers on the map saying "Accuse". You can accuse as often as you like; all it will do if you are wrong is give you less money at the end. Once you have successfully found the killer, you need to return to the police officer and turn the case in. You will be rewarded with a weapon or piece of armor, and the trophy will unlock shortly afterwards.