When twelve-year-old Reid DeBurgh finds a book with a curious symbol on the cover in her upstairs attic, she doesn't realize it holds a powerful mystery. Soon, a family trip takes Reid to the misty and magical land of Ireland, where a kind old seaside shopkeeper gives her a rare bloodstone in a small velvet pouch.

Reid doesn't think much of the bloodstone until a boat she is in capsizes. But Reid doesn't drown; she suddenly finds herself in the weird and wondrous underworld of Elddim. While her family frantically searches for Reid, hoping she hasn't been lost to the depths of the sea, the young girl meets Damien and learns that she isn't the only one with a bloodstone-and that the gem may be far more than just beautiful.

If she is ever to return to her family, Reid needs to find four treasures. With the help of her newfound friend Damien, Reid must fight evil creatures and release the spell the land has been under for far too long.

Filled with all the enchantment and fantasy of a fine Irish folk tale, Dena Blossey's Under the Bainin Rock is a charming story that explores the meaning of heroism and true friendship.