A concise but scholarly introduction to the Apocrypha as presented in the New Revised Standard Version of the Bible. This is good for people who have little to no knowledge at all of these texts. Harrington summarizes each text, discusses problems of scholarship and states why it is important in Judaism and the various major branches of Christianity. Although he is a Jesuit, one detects very little, if any, Catholic bias; the author does his very best to be ecumenical, I think.
Most of these books are considered canonical or at least deuterocanonical. There has always been recognition that they do not have the credentials to fit into the Hebrew canon. Some of them are attributed to individuals mentioned in the canonical Scriptures and yet it's fairly obvious that these claims of authorship are not sound. Some texts betray a lack of knowledge about historical and geographical details. Others betray the influence of Hellenistic thought.
And yet these texts are important because they develop and comment on various concepts contained in the Hebrew Scriptures. They form a bridge between the Old and New Testaments, and their influence can be sensed in the ways used by some New Testament authors to formulate their ideas.
One unifying theme which Harrington finds throughout the Apocrypha is suffering. Characters react in various ways to trials whether they be of a personal nature or whether they stem from persecution by foreign powers. They ponder the reasons for suffering, and look to God as a source of strength during tribulation and victory over it.