Quentin wakes up on a Saturday to his parents, Margo's parents, and a detective in his dining room, he then talks to the detective and tells him what happened on that night.
When did you last see Margo?
Quentin tells Radar and Ben about Margo and they begin looking for clues... They find various clues including writing on a building that says “YOU WILL GO TO THE PAPER TOWNS AND YOU WILL NEVER COME BACK.”
Margo is missing!
We should look for clues
Quentin comes to the conclusion that Margo went to Algoe NY, a paper town. He along with Ben, Radar, and Lacey skip graduation and go to find her. On the way they stop a few times at gas stations and almost hit a cow.
We have to skip graduation and go find Margo!
We have to call our parents first!
They drive around until they find an old barn with Margo's car parked outside of it. They assume that it was the Agloe General store and they go inside to find Margo writing at a desk.
Eventually Margo goes outside and quickly makes Ben, Radar, and Lacey mad, so they go to a motel. Margo then explains the situation.
Then why did you leave all the clues?
I didn't want to be found!
After she explains herself Quentin and Margo drive to see the others at the motel and then Quentin says goodbye to Margo.