Set between the events of Half-Life and Half-Life 2, Alyx Vance and her father Eli mount an early resistance to the Combine's brutal occupation of Earth.

The loss of the Seven-Hour War is still fresh. In the shadow of a rising Combine fortress known as the Citadel, residents of City 17 learn to live under the rule of their invaders. But among this scattered population are two of Earth's most resourceful scientists: Dr. Eli Vance and his daughter Alyx, the founders of a fledgling resistance.

You and your father were relocated to City 17. In the years since, you've continued your clandestine scientific activity-performing critical research, and building invaluable tools for the few humans brave enough to defy the Combine.

Every day you learn more about your enemy, and every day you work toward finding a weakness.

Lean around a broken wall and under a barnacle to make an impossible shot. Rummage through shelves to find a healing syringe and some shotgun shells. Manipulate tools to hack alien interfaces. Tear a headcrab off your face and throw it out the window. VR was built for the kind of gameplay that sits at the heart of Half-Life.