A few days after the nightmare realm spilled into Gravity Falls, Bill Cipher got sent back to the mindscape. Since Stan regained his memory, Bill got himself back to the only place he could go. But he had a plan, and it involved getting a human child to send to Gravity Falls. That is where his new adopted daughter, Harper Cipher, came into play. She would be sent to Gravity Falls during the summer with one mission, to find a way to bring her father back. Also go check out @Hufflepuffleness for great books! Disclaimer! - I do not own most of the characters from this book! They are from Alex Hirsch's Gravity Falls! I only own the plot and a few of the characters!