We finally know how Sanctuary will figure into the DC universe.

EW has learned that Batman writer Tom King — who appeared on Late Night with Seth Meyers on Tuesday — is teaming up with frequent collaborator Clay Mann for Heroes in Crisis, a new seven-part limited series that will explore how Batman, Superman, Wonder Woman, and more heroes handle the trauma of their lives as they deal with a murder mystery.

Due in September, Heroes in Crisis will mark the introduction of Sanctuary, a crisis center established by the Trinity that uses Kryptonian technology, Amazonian mysticism, and Bruce Wayne’s money to help “superheroes who spend their lives fighting villainy and protecting others.” Created by King, a former counterterrorism operations officer with the CIA, Sanctuary and the limited series reflect his ongoing interest in exploring the consequences of violence on those involved. This theme has been present in almost everything he has written, including Batman (see the I Am trilogy, Kite Man, or how Batman’s relationship with Catwoman asks whether happiness is possible for the Dark Knight), Omega Men, and Mister Miracle (which begins with its titular hero attempting suicide).

“I feel like I’m part of a rolling generation of people who spent their 20s overseas fighting terrorism,” King said in a press release. “Millions of people cycle through that machine and come home to America. And I think that sort of experience of violence is shaping who we are as a culture, and as a country. And I want to talk about that. I want to talk about that experience, the experience of what violence can do to a person, to a community, to a nation, to a world.”

This isn’t the first time Sanctuary has come up in DC Comics. It has been referenced in King’s Batman and Christopher Priest and Carlo Pagulayan’s Deathstroke. According to the press release, Heroes in Crisis will explore the first time that Sanctuary fails and how that affects the entire universe. The cover image, which you can see below, also teases that Booster Gold and Harley Quinn will play roles in the story too.

“If I could do anything to the DCU,” said King, “it would be to bring a sense of community of superheroes and people. I feel a duty to talk about what violence does to a society through the comics I’m creating.”

Here’s the official description of the project:

“Heroes in Crisis is not a tale of universes colliding and dying. Instead this is a story centering on the humans and superhumans under the mask; this is about what allows them to get up and fight when it appears they can’t ever get up and fight again. When it’s too much, and it’s often too much, heroes go to Sanctuary — created by Superman, Wonder Woman, and Batman — to find a moment of safety before returning to a universe of violence. Heroes in Crisis is also about what happens when Sanctuary fails, resulting in catastrophic consequences for the DCU.”

Check out the full cover:

Image zoom DC