Riley Carson is excited about her dad's return from a biblical expedition, but the excitement is just beginning when he comes home with a slingshot from Bethlehem! Riley and her best friend, Gabe, grab the slingshot, and it sends them back in time...all the way to the battle of David and Goliath! In order to return home, they must get the slingshot back, but will they get it? Or will they come face to face with a giant? Find out in The Bible Time Travelers: Book One, "A Giant Problem."