I doubt if I can do better than this description of the book by Jessica Voelker in Seattle Met magazine:

A heady romp through the mind of an intellectual adventurer who relishes curiosity and questioning over the dubious comforts of dogma and certainty.

For more detail, here’s what the cover copy says:

A widely admired writer on religion celebrates agnosticism as the most vibrant, engaging – and ultimately the most honest – stance toward the mysteries of existence.

One in four Americans reject any affiliation with organized religion, and nearly half of those under thirty describe themselves as “spiritual but not religious.” But as the airwaves resound with the haranguing of preachers and pundits, who speaks for the millions who find no joy in whittling the wonder of existence to a simple yes/no choice?

Lesley Hazleton does. In this provocative, brilliant book, she explores her own agnostic stance, making a spirited argument for acknowledgment of the unknowable and for the vital role of both mystery and doubt in keeping us human.

Breaking agnosticism free of its stereotypes as watered-down atheism or amorphous “seeking,” she celebrates it as a reasoned, revealing, and sustaining stance toward life. Stepping over the lines imposed by rigid conviction, she draws on philosophy, theology, psychology, science, and more to explore, with curiosity and passion, the vital role of mystery in a deceptively information-rich world; to ask what we mean by the search for meaning; to invoke the humbling yet elating perspective of infinity; to challenge received ideas about death; and to reconsider what “the soul” might be.

Inspired and inspiring, Agnostic recasts the question of belief not as a problem to be solved but as an invitation to an ongoing, open-ended adventure of the mind.