Bitty, a 16-year-old girl from Idaho leaves the comfort of her home in search of Jimmy, her childhood sweetheart in San Francisco. Instead of being reunited with Jimmy, she finds herself penniless and with no place to stay. She happens to meet Maggie, a 17-year-old runaway and they become fast friends. The two girls face a world of trouble when Maggie introduces Bitty to group of older girls that use them to run drugs across town.