Dolphin in the Deep

 is a book in the Animal Ark book series, written by Lucy Daniels, which was first released in a unknown date.

Summary
A trip to the States is a dream come true for Mandy! She loves playing with two tame dolphins, Bob and Bing. But when Bob dies, the lonely Bing pines for company. But will Mandy's daring plan to cheer him up work?