Iona Sheehan has just taken the biggest gamble of her life. Leaving her job, her home and her family in Baltimore, she has come to Ireland in search of adventure - and answers.

Iona has always felt a powerful connection to the home of her ancestors. So when her beloved grandmother confesses an extraordinary family secret, she can't resist visiting County Mayo to discover the truth for herself. Arriving at the beautiful and atmospheric Castle Ashford, Iona is excited to meet her cousins, Connor and Branna O'Dwyer, for the first time. And when she lands a job at the local riding school she finds herself drawn against her will to its owner - the hot-tempered but charismatic Boyle McGrath. Perhaps in County Mayo she has found her true home at last.

What Iona doesn't realise is that her cousins have been expecting her for a long time. Connor, Branna and Iona have all inherited a powerful but dangerous gift from an ancestor known as the Dark Witch. And they are about to discover that some old legends can return to haunt the present . . .