Callahan Billionaires Books in Order

A woman seeking a better life for herself and her brothers takes a job with demanding billionaire Kian Callahan. Pretending to date her boss complicates their hostility, especially when unwanted attraction threatens the independence she hoped to establish.

Her father’s will ties a young woman’s inheritance to a year of marriage with Kingston Callahan, her brother’s best friend. Determined to claim the cottage she loves, she enters an arrangement complicated by hostility and unexpected desire.

A woman tells her dying grandmother she is engaged to billionaire football player Kieran Callahan, her best friend. When the lie reaches the press, he agrees to pretend, but their closeness begins changing a friendship both thought understood.