What is the main conflict in A Ring of Endless Light by Madeleine L'Engle?

A Ring of Endless Light by Madeleine L'Engle is the story of almost-sixteen-year-old Vicky who comes to Seven Bay Island for her annual summer visit. This time, instead of spending two weeks like usual, her family is staying for much longer since her grandfather is dying. With three different young men interested in her, Vicky is thrown into a whirlwind of emotion as she deals with relationships, life, and death.