Story: You are a black ops male agent, sent to eliminate DR. Gallagher, former member of the Black mesa science team, who is hiding in the Dead end night club. You aren't able to find him, but in the warehouse, you hear a .357 Magnum being fired. It was DR. Gallagher, that commited suicide. You pick up the bomb (As seen in the case in Opposing Force, with 2 Black ops activating the bomb), Let yourself captured by the grunts, in the jail, go to a dirty rotten cell. you make your way out, get to Black mesa. When you set the bomb, you are shot by Adrian Shepard, but NOT killed. You see the G-man re-arming the bomb, you wake up, but you must get out of there.
Good classic mod for classic game, very nice level-desing, good gameplay and pretty long playtime. If you like original Half-Life, I think, this mod you'll like too.