I am stuck in this game-anybody playing it ?

1) "The 4 letters exposed by cutting out the black markings" There are 8 black markings. I cut the 4 of them and I have 4 empty holes. I can't cut the rest 4 and I don't see any letters inside the holes. Where do I have to use the letter? 2) On the map (police station) I can see the library but I can't go there using my map - there's not such building. Is that ok?...

Hello, I can't detect the fingerprint in Alman Security..I put the graphite on the fingerprint reader, then tried with the tape..maybe I miss something..please help. Thank you