A ring of endless light

"During the summer her grandfather is dying of leukemia and death seems all around, 15-year-old Vicky finds comfort with the pod of dolphins with which she has been doing research."@en
"During the summer when her grandfather is dying of leukemia and death seems all around, 15-year-old Vicky finds comfort with the pod of dolphins with whom she has been doing research."
"The death of a family friend isn't the only tragedy of the summer, and Vicky Austin wonders if she'll ever be happy again. But that's before she is befriended by Adam Eddington, a young scientist, and his remarkable dolphins."@en
"After a tumultuous year in New York City, the Austins are spending the summer on the small island where their grandfather lives. He's very sick, and watching his condition deteriorate as the summer passes is almost more than Vicky can bear. To complicate matters, she finds herself as the center of attention for three very different boys. Zachary Grey, the troubled and reckless boy Vicky met last summer, wants her all to himself as he grieves the loss of his mother. Leo Rodney has been just a friend for years, but the tragic loss of his father causes him to turn to Vicky for comfort--and romance. And then there's Adam Eddington. Adam is only asking Vicky to help with his research on dolphins. But Adam--and the dolphins--may just be what Vicky needs to get through this heartbreaking summer."@en