Today is a miscellaneous kind of day, so these recommendation will not fit any specific category.
The first two are books I’ve recommended to those struggling with doubt beyond issues of believing in Christ. These address the issues of the existence of God. As I have written before, both of the authors are atheist/agnostic themselves. They are not exploring the reality of salvation as much as the weakness of New Atheist arguments against the existence of God. The Devil’s Delusion is by David Berlinski. Reason, Faith and Revolution is by Terry Eagleton.
Wild at Heart by John Eldredge is for all men. It is not new by any means, but if you are a guy who has not read it, get it. If you are a woman who’s husband has not read it, Christmas time’s a-comin’. (A companion guide Field Manual is also available.)
Hitler’s Cross, by Erwin Lutzer, deals with the theological realities of the Third Reich and the failure of the German church (as a whole) to adhere to the scriptural admonition to love one’s neighbor as him or her self.