Jody McGrath and her family are sailing around the world researching dolphins, and Jody records all their exciting adventures in her Dolphin Diaries. In the series' fourth book, Jody is at Dolphin Haven in the Bahamas, where dolphins Bella, Misty, and Evie are about to give birth. Everyone is excited, but also worried. In the past, Evie's calves have died, and this may be her last chance to become a mother.
Misty's and Evie's calves survive, but Bella's calf does not. Although the crew is saddened over the stillborn calf, they still rejoice in the two new dolphins.