Two holiday novels provide the perfect combination of mystery and murder mixed with a generous helping of Yuletide cheer. A CHRISTMAS GUEST When her daughter and son-in-law plan a Christmas vacation to Paris sans hers truly Grandmama Mariah Ellison travels to the chilly windswept Romney Marshes to spend the holiday with old friends. But when the body of a fellow guest is found lifeless in bed Grandmama senses foul play and takes it upon herself to assume the role of amateur detective-uncovering startling truths about the victim . . . and herself as well. A CHRISTMAS SECRET Dominic Corde is thrilled to fill the robe as substitute vicar in the village of Cottisham while the Reverend Wynter is away on a Christmas holiday. Upon arrival Dominic and his wife Clarice wonder how they will be received by the congregation. But the Cordes soon discover that they have more dire matters to worry about. It turns out that the Reverend Wynter isn t on holiday at all-and that something very sinister has transpired.