When Penny begins searching for the source of the mysterious whistling she hears in her sleep, her parents take her to meet her great-great-uncle, who tells her about her Cherokee heritage.
When the four young teens from Okracoke Island, North Carolina, travel to England to return pirate loot stolen from Westminster Abbey in 1718, they learn of far deeper mysteries concerning the Stone of Scone and Blackbeard the pirate.
After giving their friend Mrs. McNemmish the pirate burial at sea that she wanted, four friends, living on Ocracoke Island, North Carolina, find themselves drawn into a dangerous adventure related to the long-ago exploits of the pirate Blackbeard.