Karen Kingsbury's The Christmas Ring.

At a 'Christmas in July' sale, military widow Vanessa Mayfield crosses paths with antiques dealer Ben Miller. As Ben works in Vanessa’s hometown, their friendship begins to grow into something more. But trouble brews when Ben’s father unknowingly acquires a box of antiques containing Vanessa’s missing heirloom Christmas ring - a priceless piece of her family’s past. Planning to sell it, he has no idea of its true meaning. It will take a Christmas miracle for love, family, and the ring to come together.