This is most popular Islamic text book used in the English speaking world for the past decade. It is now in two parts:
Part One teaches about:
Aqeedah
Fiqh
Islamic manners and morals
Seerah
Part Two teaches about:
Men and women around the Prophet Muhammad
Stories of the prophets
Supplications and invocations
Hadiths
This is a great Islamic book for kids. It is one of the books that is important for learning about Islam.