Gravity Falls starts with the 13-year-old Dipper Pines being sent off to the titular town alongside his sister to spend the summer vacation with their Great Uncle Stan.

Gravity Falls' best episodes are hilarious, spooky, and satisfying, featuring the high points of the overall story while maintaining some mysteries.

Written by series creator Alex Hirsch, The Book of Bill is a humorous tie-in that reveals more about Gravity Falls and the mysterious Bill Cipher.