Title: The Secret Stair
Description: The "Van Dirk Treasure" is a bejewelled and illuminated manuscript of a "Book of Hours," which has been in the family for generations.  It should have gone to Philip, who was the last of his line, but mysterious circumstances surround both Philip and the book, and it is not until Sally Shaw goes to live in the old Van Dirk mansion by the river that matters are set right.