You have to find them in different places, this is the best I could find :
Target 1 (Flats Target) - dwarf- head towards the Astrarium by Old Crestwood, if your approaching from the Flats you will bump right into him
Target 2 (Black Fens) - Human male - He is pretty close to the dragon ... so watch out. He is just North Westish from the dragon, by the quarry if you already discovered it.
Target 3 (East Hill) - Human Female - This one was annoying as hell to find, but she is really by the docks ... just not the ones you are probably thinking of. North West of (new) Crestwood is a small lake that has a dock and a fishermans hut. She will be just outside.
For the book just look next to Cole, it is right next to him ... don't need to do any fancy conversation friend BS.