Michelle Richardson, known to everyone as Shelly, was a baby left at a station with a note and a teddy bear. She is cared for in a children's home, not knowing anything about herself, not even her real name. As she grows, however, she gets recurring dreams in which she sees a grand building and she feels within herself that is it a place that is important to her. Whilst on holiday in North Wales with her friend Lynn and her father Pete, Shelly spots a mysterious castle among trees that seems to captivate her mind. Despite entry to the grounds being forbidden, Shelly is irresistibly drawn into exploring, aided and abetted by Pete and Lynn. Having found the castle that had called her in her dreams, Shelly now embarks on a voyage of discovery which will take her to the other side of the Atlantic and back, fearless of lurking danger. As Shelly finds out the secrets of her family, Castel Glas finally succeeds in calling those that belongs to it home again but will it all end in disaster?