Ralestone Luck is a novel by American author Andre Norton.
Rupert Ralestone is officially the Marquess of Lorne--but with no family money or prestige, the title is worthless.
He and his younger brother and sister return to the old family homestead--Pirate's Haven.
Their only hope is to find the family's talisman, a great sword, and restore it to its proper place. If they succeed, the family fortunes will follow...
Ralestone Luck was first published in 1938.