Alba lives in a flat in the city with her family. Her dad is a scientist. A breed of superbugs is destroying all the apple trees in the world and Alba's dad is working hard to save them. He has the last apple pip left in the world safely at home in his flat. Max from the lab, sneaks into the flat and tries to steal the pip. Alba escapes with it but Max shrinks her to 10 cm tall. She has to get the pip to her dad in the lab and save the apple trees. Will she succeed in crossing the city and getting the pip safely to dad? Will she ever be a normal size again?