Simplify the following text for a Grade 6 native English-speaking person.
Original: It is the sixth book in Card 's The Tales of Alvin Maker series and is about Alvin Miller , the seventh son of a seventh son ( which gives him magical powers ) .
Simplified: It is the sixth book in Card 's The Tales of Alvin Maker series and is about Alvin Miller , the Seventh son of a seventh son .