Watch the trailer for Fallout 4’s first big expansion

Downloadable content has been rolling out for Fallout 4 since the "Automatron" add-on in March, but later this month comes the biggest so far: "Far Harbor," the game's first proper expansion. "Far Harbor" introduces a brand-new location — which developer Bethesda claims is the "largest landmass" it has ever added to a game — and a new case for everyone's favorite synthetic detective Nick Valentine. Here's how the studio describes the setup:

In "Far Harbor," a new case from Valentine's Detective Agency leads you on a search for a young woman and a secret colony of synths. Travel off the coast of Maine to the mysterious island of Far Harbor, where higher levels of radiation have created a more feral world. Navigate through the growing conflict between the synths, the Children of Atom, and the local townspeople. Will you work towards bringing peace to Far Harbor, and at what cost?

"Far Harbor" is launching May 19th for all versions of the game, including PC, Xbox One, and PS4, for $24.99.