Glory to the new-born...infant?

It's Christmastime in Caerphilly. Meg, full of holiday spirit, is directing a nativity pageant when she finds a surprise in the manger: a living, breathing baby girl. A note from the mother says it's time for the father to take care of her – and implicates Meg's brother, Rob, as the father. A DNA test can reveal the truth but Rob's afraid that suspicion itself could derail his plan to propose to the woman he loves. So Meg, always up to the task, makes it her merry business to find proof of paternity. But her investigation into the life of Lark, as the infant is named, leads to more questions than answers. Is someone using Lark as a pawn in a sinister game? And why does Meg feel that she is the one being threatened most of all?