Hambly, K: Christmas Guest

Jodie loves travelling in her pink camper called Betty, but a promise she made to her grandfather steers her back home to Wales for Christmas. The Christmas Cottage Guesthouse was left to her in his will, and before she can sell it on, she must run it for one last Christmas. Upon arriving home, a guest shows up and it turns out he's the only one. Could her grandfather had known something before he passed or is the cottage magical?