The Sandman: Overture is a six issue comic book miniseries written by Neil Gaiman with art by J.H. Williams III. It is a prequel to Gaiman's The Sandman series, and debuted in 2013, about 17 years after the end of the regular comic. From Wikipedia
The two-part July drop adapts fan-favorite comic arcs with a finale on July 31 featuring a standalone episode of Death: The High Cost of Living