YOU'RE WELCOME TO ULSTER by Menna Gallie. 256 pages. Harper & Row. $6.95.
A beautifully written, cleanly unsentimental love story is cause enough for celebration. But Author Gallie has done more. She has skillfully used as background the divided heart of present-day Northern Ireland.
Welsh-born Sarah Thomas is a middle-aged widow working in Cambridge, England. Threatened by breast cancer, she seeks a "last" holiday in Ulster with two close Catholic friends, Caroline and Colum Moore, and a former lover, a Protestant left-wing journalist named James McNeil.
Her sentimental journey creates more chill than charm....