By Isabella Biedenharn
Updated September 22, 2015 at 12:00 PM EDT

Bill Griffith, the cartoonist who brought you Zippy the Pinhead, turns his eye and his pen inward in a new graphic memoir. In Invisible Ink: My Mother’s Love Affair with a Famous Cartoonist, Griffith delves into his mother’s mysterious, secretive past, which, as the title suggests, included an affair with a famous cartoonist and crime novelist.

Invisible Ink hits shelves on Oct. 3, but EW has an exclusive sneak preview of the first few pages below.