I find myself puzzled by the other review of this book on this site; regardless, let me offer an alternative view on Jacoby's most recent work, 'What's the Truth...'
Jacoby is nothing if he isn't thorough, interacting with a lot of different scholars and populist treatments of what is often a very sensationalized (and lucrative for publishers) topic. Whilst Jacoby is clear on where he stands, he covers all the bases with due respect and humility, sometimes conceding that there isn't enough to make a final judgment on some matters.
What I appreciated was the reminder that the early church had differing views on what happens next (specifically in terms of eternal torment, universalism, conditionalism/annihilation), and ones views on the matter were not seen a reason to break fellowship (a welcome reminder to the sadly fractious state of things today). Jacoby also includes a version of a podcast he had previously published on the subject of tolerance, judging, and exclusivism, another teaching that is desperately needed and appreciated.
Jacoby rounds off with a challenge to live as Jesus would have is live: a life in tune with God and God's will, to not just 'call' Jesus Lord but to seriously 'make'him Lord.
If you want to be challenged, if you want to do some critical thinking, if you want to see an evaluation of thoughts and trends on heaven, hell, purgatory, Hades and the like, and want to be given enough information to make up your own mind, then this book is an excellent start.