Paper Towns question

I chose this book because I needed a book to read and my sister recommended it to me because she really enjoyed the book. I though this book was really interesting and intriguing. In this book the main characters Margo and Quentin meet one night and Margo wants his help for an elaborate scheme she has planned against her friends. Throughout the story the two characters get closer and fall in love, but Margo goes missing and Quentin is determined to find her.