In order to receive a surprise inheritance, social media expert Maddy Montgomery must live in her great-aunt Octavia's house in New Bison, Michigan, for a year, running her bakery and caring for a 250-pound English mastiff named Baby. With help from her aunt's loyal friends, aka the Baker Street Irregulars, Maddy feels ready to tackle any challenge. Until New Bison's mayor is fatally stabbed, and Maddy's fingerprints are found on the knife.