The Hardy Brothers Detective Stories is a classic, original series of stories about brother detectives. It was published from 1927 to 1979. AST Publishing House publishes this series under the title “Detective Brothers Hardy.”

Terrible and incomprehensible things are happening in the Black Valley: heartbreaking screams are heard at night, local residents’ dogs are disappearing. There are rumors that this is all the work of a witch. The famous detective Fenton Hardy receives a letter asking for help from his friend living near the Black Valley. The detective's sons, Frank and Joe, take on the case. But when they arrive at the place, it turns out that their friend has disappeared without a trace.