That is, THE MASTER'S WALL. It's a book just coming out through DeWard Publishing, by Sandi Rog. I read and enjoyed it. It's well worth your time and your teenager's, since the main characters are much younger than "adults" in the present age.
Set in Roman times, it tells the story of David, a Messianic Jewish boy who's sold into slavery to a wealthy Roman villa-owner. It tells the story of Alethea, a Greek girl who doesn't understand much about what's going on around her, and is determined on her own way...
Grab this book. Watch this pair clash--and clash--
Background data. Sandi is an ACFW pal, historical-writing pal, and conqueror of MS, which has laid her low several times since I first met her. Currently, though, she's battling lymphoma in the brain, and is undergoing therapy. Her publisher, DeWard, is donating $1 of every sale of this book as a benefit/fund-raiser for Sandi.
That's over and above what many publishers would do. Our part is to go buy this book. I plan to score several more copies.