Ring of Endless Light: The Austin Family Chronicles, Book 4

Vicky Austin is filled with strong feelings as she stands near Commander Rodney's grave while her grandfather, who himself is dying of cancer, recites the funeral service. Watching his condition deteriorate as the summer passes on beautiful Seven Bay Island is almost more than Vicky can bear. To complicate things, she finds herself the center of attention for three very different boys: Leo is an old friend wanting comfort and longing for romance; Zachary, whose attempted suicide inadvertently caused the Commander's death, is attractive and sophisticated but desperately troubled; and Adam, her older brother's friend, offers her a wonderful chance to assist in his experiments with dolphins but treats her as a young girl just when she's ready to feel most grown-up.