Yes, the same Catholic publisher that publishes classics such as
God Has No Religion.
Not that all their books are bad of course. They do publish some
really great books as well. My point is simply that being published by a Catholic publisher does not necessarily mean it’s going to be a book worth reading.
As for this particular book, I cannot say. You have to know yourself and whether something like this could threaten your faith. I cannot answer for you whether this would threaten your faith.
I’ve read several books on Medjugorje written by those who support it. They were uplifting at the time I read them (many years ago now). But if the Church condemned the apparitions tomorrow as being a trick of the devil, I’d not hesitate to follow that determination and back the Church 100%. If you can do the same, then you will probably be fine. However, if you feel like you’re the type who could easily get swept up in such things and would be unable to let go of it all should the Church determine the appartions are not authentic, then I would recommend avoiding it.