At Animal Ark, Mandy Hope helps her parents treat animals of all shapes and sizes. Even outside the clinic, Mandy can't resist helping any animal in need.

A young girl befriends an orphaned badger cub.

James is chosen to look after the school hamster during the summer, but someone vandalizes his garden and steals the poor little thing. Who's behind the theft? City kids visiting the town or someone closer to home?

Mandy's been spending most of her Florida vacation at the local animal park, playing with two tame dolphins, Bob and Bing. The dolphins are happy performing together, but when Bob dies, Bing seems lonely and depressed. Mandy and her friend, Joel, worry about Bing's future. They come up with a daring plan to set him free.

Could it be a ghost horse? Mandy and James are sad because their friend Wilfred Bennett has to sell his riding stables. Things get even worse when Sam Western turns the land into a campsite and wants everyone to forget the stables ever existed. Now campers are telling stories of a ghostly horse and rider passing through the campsite - the vanishing into the night air! Mandy and James don't believe the spooky tales, but can they figure out what is...

"At Animal Ark, Mandy Hope helps her parents treat animals of all shapes and sizes. Even outside the clinic, Mandy can't resist helping any animal in need. When Mandy's dad diagnoses an Old English sheepdog puppy as deaf, Mandy feels sorry for it. But it isn't until she finds another sheepdog puppy weak and abandoned that she and James begin to get suspicious. Could a local breeder be mistreating these poor puppies?"--P. [4] of cover.

Mandy and James discover a stray cat and her kittens and try to save them.

While helping to set up a Santaland outside Walton Cottage Hospital, Mandy and James spot a stray Jack Russell terrier. They also befriend Charlie, a young patient, who desperately wants a dog for Christmas. Can they bring the two together?