In order to march with Mr. Finnigan in the St. Patrick's Day Parade, Mary must find a perfect shamrock in Manhattan in the middle of winter.

In the diary account of her journey from Ireland in 1847 and of her work in a mill in Lowell, Massachusetts, 14-year-old Mary reveals a great longing for her family.

The last thing eighteen-year-old Wilhelmina "Willa" MacCarthy wants is to be a nun. It's 1936, and as the only daughter amongst four sons, her Irish–Catholic family is counting on her to take her vows-but Willa's found another calling. Each day she sneaks away to help Doctor Katherine Winston in her medical clinic in San Francisco's Richmond District. Keeping secrets from her family only becomes more complicated when Willa agrees to help the doctor...

On his way from Ireland to America to escape the potato famine, young Fergus carves a shillelagh from his favorite blackthorn tree, and each St. Patrick's Day for generations, his story is retold by one of his descendants.

In 1929 New York City, twelve-year-old housemaid Martha O'Doyle suspects that a wealthy recluse may be trying to communicate with the outside world through the paintings on her gallery walls.

In 1903, Maureen, originally from Ireland, comes to Bostom to live with her old friend Sofia and her Italian American family, where the two girls share fifth grade class and various adventures.

Soon after the mysterious and alluring Finn arrives at her family's home, sixteen-year-old Teagan Wylltson and her disabled brother are drawn into the battle Finn's family has fought since the thirteenth century, when Fionn MacCumhaill angered the goblin king.