The Happy Hollisters is a series of books about a family who loves to solve mysteries. The series was created by the Stratemeyer Syndicate

Stratemeyer Syndicate

The Stratemeyer Syndicate was the producer of a number of mystery series for children, including Nancy Drew, the Hardy Boys, the various Tom Swift series, the Bobbsey Twins, the Rover Boys, and others.- History :...

 and entirely written by Andrew E. Svenson

Andrew E. Svenson

Andrew E. Svenson was an American children's author, publisher, and partner in the Stratemeyer Syndicate. Under a variety of pseudonyms, many shared with other authors, Svenson authored or coauthored more than 70 books for children, including books for the Hardy Boys, Bobbsey Twins, Tom Swift, and...

 under the pseudonym Jerry West. Helen S. Hamilton illustrated the books. The official website for the Happy Hollisters is www.TheHappyHollisters.com.
This series recounts the adventures of a young American middle class family solving mysteries from their home on Pine Lake in Shoreham.