When a rare white tiger cub goes missing from the Animal Park, Lexi, Lottie and Fred investigate. After tracing the theft to a school friend and fellow journalist of Fred's, they arrive too late, the tiger cub has run away. With a bit of 'animal profiling' and an important clue that Lottie pieces together, they finally track it down to the home of an old lady who thinks it's a kitten.

Camilla the gorilla at the Animal Park loves to paint, and her bright and colourful canvases are displayed outside her enclosure. When someone steals her paintings, Camilla goes into a decline. The Detectives and Fred soon find the art works for sale in a local gallery, but can't prove it was painted by a gorilla. So, with Camilla wasting away, they take extreme action and reclaim the art.

When a valuable violin goes missing in the Animal Park, the suspects include another violin player and a music shop owner. The Trusty Twin Detectives and Fred need to act fast to solve this crime, and find the missing violin before the sunset concert. Meanwhile, Lexi hilariously doubles for Lottie in the band so Lottie can concentrate on following the sound of the violin.

Lexi, Lottie and Fred's investigations around a missing pig lead them to a children's author who is writing a crime book with a pig as the main character. Unfortunately for Lottie, Augusta Ritchie, the pig thief is her favourite crime writer and becomes disillusioned by her hero and her unscrupulous research methods.

When Tammy the Turtle falls mysteriously ill, Lexi and Lottie suspect someone has poisoned her. However, after some super sleuthing, the girls soon realise that Tammy hasn't been poisoned after all. She has become sick as a result of Lexi forgetting to clean the tank's filter. Lexi learns a tough lesson in concentrating on what you are doing.

Lexi and Lottie, wearing panda costumes, try to earn money for a new panda enclosure by busking in town. At the same time, two crooks - also wearing panda costumes as disguises - are robbing a bank. The police chase Lexi and Lottie thinking they are the criminals and in the confusion, not only do the bags of money get switched but Lexi ends up with one of the criminal pandas.