The first book The Seventh Son starts a the story of Alvin, the seventh son of a seventh son, who by default is imbued with powers. In the first book he is a young child who must understand his powers and how to use them.
The second book Red Prophet continues the tale of Alvin as he searches for his destiny and how this affects the people around him.
This series has six books in all, with a possible seventh (which would make sense since seven is such an important number) in the works. Throughout these tales, we meet many people who grow and change along with Alvin. One of the elements I like best about this series is that it is a historical fantasy, using elements of American history in its tales and explaining them in new and interesting ways.
If you're a fan of Mr. Card, of fantasy, or of American history, this is a series to check out.