A tie-in to the two-season series Gravity Falls, The Book of Bill delves into Bill Cipher's origins and where he landed after the show's finale.

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.

Alex Hirsch talks about Bill Cipher, Summerween, Gravity Falls, and which character deserves a 50 Shades of Gray-style spinoff. The Book of Bill is out now.

This is the first Gravity Falls book intended for "older readers," as it dives deep into the world of the interdimensional demon, Bill Cipher.

A month prior to the release of The Book of Bill, Deadline reported that Disney had begun clearing a path for more Gravity Falls by entering preliminary Season 3 conversations with Hirsch.

Alex Hirsch's Gravity Falls was the focus of Disney's "How NOT to Draw," with Bill Cipher looking to make a dimension-hopping deal.

Topping the Amazon best-sellers chart, here's where you can buy the hardcover and B&N exclusive versions of 'The Book of Bill' online ...

After a one-month blip of higher confidence, consumers are more downbeat again Tariffs, a new tax-and-spend bill, conflicts in the Middle East … It’s all just a lot.

Treasury yields rose amid somewhat benign indicators and as Trump’s tax-and-spending bill advanced.

UNC football and coach Bill Belichick will not be featured on "Hard Knocks" after a deal fell through with NFL Films.

The House Ways and Means Committee gathered for a marathon meeting before voting 26-19 to approve a $3.8 trillion tax cut.