Date of composition

• Late 100s at the latest, since it is mentioned by Irenaeus (d. c. 202).

Type of Apocrypha (heretical or in error (made up))

• One quote mentiones a "perfect knowledge," which is a gnostic idea and, therefore, heretical.

Length

• All we have are various quotes from Clement of Alexandria, maybe 2 double-spaced pages.

Summary

• One summary is not possible since we have different quotes.

Noteworthy from the book

1. It warns against worshipping and living like Gentiles and Jews. For example, it states, "We are Christians, who, as a third race, worship in a new way."
2. It states that the Apostles, when reading the Old Testament (called "books of the prophets"), were able to discern the many verses that prophesied Christ.

Go here for the quotes.