The fifth book in the Learn with Alex and Anna series. One foggy morning, Alex was trying to find out if an overnight experiment with one of Anna's dolls had worked. He wanted to discover if toys really do come alive when humans are not around. Grandpa arrived as the strange mist lay on the ground in the garden. Intrigued to learn that monsters may be lurking in the mist, Alex was in now in a panic for the whereabouts of Anna's doll. In his search for Dolly, Alex and Anna then help Grandpa with an experiment to learn about the water cycle and how rain falls. Read this story to find out about molecules.