Homeless women live off salvaging food from the dumpster of a discount grocery store. Meanwhile, the store's employees struggle under hardening working conditions. Complex relationships, conflicts and dependencies arise between the groups.

After an elder man gets hit by a stolen car, the police decides to investigate it. The stolen car is later found next to a murdered young girl, prompting Inspector Irene Huss and her co-workers to investigate and slowly get pulled into a world of evil.

Bitter Sweetheart is the naked truth about Lina Berglund, a perfectly normal 15-year-old who tries to start living like her friends, who seem to have so much fun.