0 0 0In short, get every Amadeus chronicles shown on the map (23), then go to -> Arkham West -> Penitentiary -> Security Control Room (south of the map) -> Look at the floor of the tower
0 1 0Find all "Spirit of Amadeus Arkham" messages.The last message: *** Spoiler - click to reveal ***is found in "Security Control Room" where Quincy Sharp was taken prisoner by Harley