If you want to be sure of getting a mystery book that’s age-appropriate for kids aged 8 and up, with no strong language or adult situations, you can’t go wrong with the Hardy Boys series of tween mystery novels. Sure, there are no plot points that hinge on the use of modern technology in these books, but there’s also no strong language, violence or adult situations.
Hardy Boys 01: The Tower Treasure (4.5/5 stars, currently priced at $5.98)
A dying criminal confesses that his loot has been stored “in the tower.”
Both towers of the looted mansion are searched in vain.
It remains for the Hardy boys to make an astonishing discovery that clears up the mystery and clears the name of a friend’s father.
Hardy Boys 02: The House on the Cliff (4.5/5 stars, currently priced at $5.98)
When Mr. Hardy disappears while investigating a mystery surrounding a vacant house rumored to be either haunted or an abode for criminals, the Hardy Boys search for the truth.
Hardy Boys 03: The Secret of the Old Mill (4.5/5 stars, currently priced at $5.98)
Determined to learn the secret of the old mill, Frank and Joe employ a clever use to gain entrance and become trapped.
There they unravel two mysteries, one involving a counterfeiting case and the other, a national security case their father is working on.
Hardy Boys 04: The Missing Chums (4.5/5 stars, currently priced at $5.98)
Two of the Hardy Boys’s chums take a motor trip down the coast.
They disappear and are almost rescued by their friends when all are captured.
A thrilling story of adventure.
Click here to browse the full catalog of Hardy Boys mystery novels in Kindle format.