"Lucy Sullivan" is a fictional character from the novel "Lucy Sullivan Is Getting Married," written by Catherine Alliott. The story follows Lucy, a young woman in her thirties, who navigates the complexities of love, friendship, and self-discovery while searching for her ideal partner. Set in London, the novel explores Lucy's relationships with her friends and family, highlighting the challenges and humor of modern dating. As she embarks on a journey of personal growth, Lucy learns valuable lessons about love and the importance of being true to oneself.