Three unlikely girls must unite to save magical creatures from an unknown threat. Emily, Adriane, and Kara, each from different walks of life, find their ordinary lives disrupted by the appearance of a talking ferret. This peculiar creature reveals that they are the chosen ones destined to protect the magical beasts of Avalon. They must overcome their differences and learn to work together to face the dangers that threaten their hidden world.

The premise of 'The Avalon Collection' suggests a classic children's fantasy narrative where disparate characters must band together for a common cause. The introduction of magical beasts and a talking animal guide points towards a story filled with wonder and adventure, likely aimed at a younger audience. The emphasis on the girls overcoming their differences indicates themes of friendship and cooperation will be central to the plot. The collection, comprising the first three books, implies a developing story arc that will likely engage readers with ongoing challenges and discoveries within the magical world of Avalon.