There are so many things happening in so many departments at Logos Bible Software (my employer) that long ago I lost the ability to keep track of it all.
So I might be late in mentioning, but did you know that Logos has two (2) books by Hans-Josef Klauck on pre-pub? They are Ancient Letters and the New Testament: A Guide to Content and Exegesis and The Apocryphal Acts of the Apostles: An Introduction. Both are excellent, and both are worth reading.
Further, Logos already has two books by Klauck available, and these are great as well. The first is The Apocryphal Gospels: An Introduction. It is worth reading if you can get a deal on it, but was published by T&T Clark so is a little spendy. The second is The Religious Context of Early Christianity: A Guide to Graeco-Roman Religions and is a little more reasonable ($34 as I write this post).
The two books that are on pre-pub are published in print by Baylor University Press, and happily they provided me with review copies (thanks again) back when they were initially published. I devoured them and still consult them today. Here are the two on pre-pub with links to the posts I wrote about them when reviewing them:
Ancient Letters and the New Testament: A Guide to Content and Exegesis
The Apocryphal Acts of the Apostles: An Introduction
Bottom line: If you are interested in learning about early Christianity and its literature (outside of the NT) and generally about Graeco-Roman religions, Klauck is a good source to turn to. These books largely serve as textbooks and they are well written. I believe all four are translations and expansions from the original German editions. While I don’t agree with everything he writes (who agrees with everything they read?) these are solid introductory volumes that will ground you well in the subject matter. Ignore them at your peril.