When Shannon was a child she was out camping and came face to face with a wolfblood, (possibly Maddy's mum or dad in their younger and wilder days, or else a roaming Wild Wolfblood). No one believed her, but since then she has been obsessed with “the beast on the moors”. She wants to prove that what she saw was real. She has her own website – “something weird on the moors.com”.
In Mysterious Developments the Beast on the Moors appears to have returned. Shannon takes a picture in the moors with the creature under a tree, and finally she has evidence. She brings her camera into school and prints out loads. She gives them to everyone, and they all believe her, even The Three Ks. But then Jimi points out that it could be photoshop, and she takes everyone to the dark room to find the memory card. Maddy follows, and notices Rhydian was there, and that he took it.
Shannon is then upset for the whole day. Jimi makes a copy of the picture she sent out, but photoshops a picture of Shannon onto it, saying she's the beast.
They then get into a fight, and their all in trouble, plus Shannon's in even more trouble for printing out more pictures. This time, ones that say:
"Have you seen this memory card? Contact firstname.lastname@example.org"
At the end of the school day, Shannon goes to where she found the beast, and talks to Rhydian. She explains the above story about the camping trip. He gives her a vegan chocolate bar, and leaves.
Shannon, having studied the beast's movements, has predicted where it will next strike. She convinces Tom to join her to go out hunting for the beast and get another picture. Meanwhile Maddy and Rhydian are accusing each other of being the beast on the moors, having foolishly been photographed.
When Maddy and Rhydian learn of the existence of Wild Wolfbloods, and Rhydian learns they Smiths lock themselves up on full moons, they realise the beast is none of them - and that Shannon and Tom are in danger. They go out to the woods and Rhydians transforms to fight the beast.
Later in the series it becomes clear that this 'new' beast was in fact Ceri, Rhydian's mother, who had come from the Wild Pack to find Rhydian and take him home.