The Lost Treasure of Lorne

For nearly 300 years, the Normingtons and the Lorimers have feuded, since a love affair ended in a curse that doomed dead Lorimers to haunt their home, the Castle of Lorne.
Now the last Marquis of Lorne, the last of the Lorimers, is one of those ghosts, and the Duke of Kendal, head of the House of Normington, holds the castle.
Kendal doesn't care about the feud or the ghosts. He wants only to find the evidence that will legitimate the son his Lorimer bride bore him before her death, and to convince his stubborn housekeeper to marry him.
But the time allotted to the curse is running out, and his happiness depends on finding the Lost Treasure of Lorne before the 300 years draws to a close.