When Grandma Bertha moved to her son’s place, she brought along three dogs, several cases of beer and many, many horror film DVDs. While her daughter-in-law insists on the idea of sending Grandma Bertha to a retirement home, a dead girl appears near the house, shot three times in the back. Many years ago, Grandma Bertha let a murderer escape for not trusting in her own detective abilities. Now, armed with her wit and wisdom, she decides to solve that crime before the police. Could this crazy dog lady be a threat to a cold-blooded killer? And for how long can the family stand that situation?