2K and Hangar 13 announced that the next Mafia III story add-on, Stones Unturned, will available on May 30th for PC, PS4 and Xbox One.

This upcoming DLC will reveal more about John Donovan, the EX-CIA agent who assists Lincoln throughout the main story campaign of Mafia III. Donovan will also be Clay’s wingman for the new missions of the DLC.

Here’s a brief synopsis of Stones Unturned’s story:

Bound by a brotherhood forged in Vietnam, John Donovan never hesitated to answer Lincoln Clay’s call for revenge. Lincoln will return the favor when Connor Aldridge, a traitor who once left Donovan for dead, resurfaces to violently upend New Bordeaux in search of highly volatile lost cargo. To stop him, Lincoln and Donovan must fight Aldridge’s mercenary army side-by-side.

The Stones Unturned add-on will also introduce new heavy weapons, turreted vehicles, sniper support and unique rewards to thwart Aldridge and protect the free world.