When Morgan's little sister jumps inside her sidewalk drawing to pick the beautiful flowers, Morgan races to get help. It's a good thing, too, because Josie is in store for a great many adventures, from a mean and nasty lion to a steep, deep, and ever so dangerous waterfall. Soon the whole neighbourhood is grabbing some chalk to help Josie. It's imagination to the rescue in this creative tale of quick-draw chalk and sidewalk shenanigans.