Veteran religion writer Cathleen Falsani didn’t know much about Justin Bieber when her 11-year-old son, recently adopted from Malawi, came home from school asking questions about the young superstar.

Interpreting pop culture was part of her parenting routine. But the questions ultimately led Falsani into an unexpected exploration of the 17-year-old singer’s evangelical Christian faith — and a new book. Belieber!: Fame, Faith and the Heart of Justin Bieber appears to have all the elements of a soon-to-be best-seller, with global press mentions and partnerships with Bieber fan clubs around the world, which come with a built-in potential base of 10 million devoted fans.

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