Nothing can trigger your imagination more that reading and feeling it with own heart and soul. If developed the interest it is next to impossible to break the habit of reading book which is one of the healthiest habit to be developed at teenagers.
If in dilemma, you can refer the following books to give a try-
1. Harry Potter Series
2. The Secrets
3. Agatha Christie Novels
4. Nancy Drew Novels
5. The Hobbit
6. The Lord of the Rings
7. The Monk who sold his Ferrari
8. Who will Cry when you Die
9. How to Stop Worrying and Start Living
10. The Diary of a Young Girl (Anne Frank)