The Grip of the Black Hand

The Grip of the Black Hand is the seventh mission in. Nick Parker has to infiltrate a chateau controlled by the Black Hand, and rescue the scientists held there.

Plot
After securing the Cathedral, Parker infiltrates the chateau relatively unnoticed. Ceiling cameras and elite soldiers quickly located him, but were unable to take him down. After gaining access to the mainframe, as well as freeing civilians along the way, he gained access to the chateau's lower levels and freed Sydney Mobius and another GDI prisoner. Sydney accidentally caused the building to become structurally unstable and start collapsing. As they were escaping, Carlos Mendoza challenged Parker, who ultimately killed him, ending their private feud. Parker and Sydney escape the fortress in a cargo truck.

Tips

 * Tertiary objective 1 is achieved by finding a resistance fighter in one of the sheds in the courtyard with the Raveshaw statue and releasing her. The objective registers when she runs away. However, sometimes she may get stuck, in which case she will keep thanking you and spawning health power-ups each time you try to make her go.
 * To complete tertiary objective 2, go to the second floor of the Raveshaw chateau and find a library. Search the bookcases there and, when a telltale bracket appears, press the Use key.
 * Tertiary objective 3 is rather obvious. When you find a GDI soldier in the underground cells, talk to him.