Lingard decided to write the first book prior to the eruption of violence in Northern Ireland in late 1969 after hearing a Protestant family friend tell a joke that she deemed to be
sectarian. Despite concern from her literary agent that publishers would reject the material on account of its coverage of political and religious strife, the manuscript for the first book,
The Twelfth Day of July, attracted interest from
Penguin Books and was published in 1970 to a mixture of positive reviews and disapproval of the book's subject matter. The book was Lingard's first novel aimed at younger readers and her first commercial success. The sequel,
Across the Barricades, sees the couple reunite 3 years later. The remaining books deal with the couple's developing romance, despite disapproval from their families, and their eventual move to England and their secret marriage. Lingard considered writing a sixth book, in which the couple returned to a post-conflict Belfast, but judged that divisions in the city still existed. As of July 2010, the books had sold 1.3 million copies worldwide and had been translated into several languages. ==Books==