To their friends’ envy, Biff and Chet plan to take a boating vacation up the coast. The joy of sending them off soon turns to anxiety as neither of them make contact with home for several days. Convinced that something’s happened to them, the Hardy boys and their friends go on a search filled with adventure and peril in hopes of retrieving their missing chums. This is the fourth book of the Hardy boys series, first published in 1928. While the author is credited to be Franklin W. Dixon, in reality, Leslie MacFarlane and Edward Stratemeyer are primarily responsible for the early volumes, including this one. This Standard Ebooks edition is based on the original 1928 text. This book is part of the Standard Ebooks project, which produces free public domain ebooks.

Teenage detectives Frank and Joe Hardy investigate a case of counterfeiting.

Frank and Joe find themselves on an uninhabited Caribbean island when they follow clues left by a gang of platinum thieves

During an extended winter holiday, the Hardy boys are summoned to Montana by their father to help with a case: recovering stolen gold. The trip out West is anything but easy; the boys’ fame and success as amateur detectives has reached their father’s enemies, who are determined to undermine a reunion. Facing dangers from man, beast, and nature, the Hardy boys embark on a journey to recover the missing gold and bring justice to the small mining town of Lucky Bottom. This is the fifth book of the Hardy boys series, first published in 1928. While the author is credited to be Franklin W. Dixon, in reality, Leslie MacFarlane and Edward Stratemeyer are primarily responsible for the early volumes, including this one. This Standard Ebooks edition is based on the original 1928 text. This book is part of the Standard Ebooks project, which produces free public domain ebooks.

The search for a missing boat leads Frank and Joe, the Hardy boys, down to Mexico where they encounter a tribe of Indians.

Not only is the local bank robbed, but two of the Hardy boys' pals mysteriously disappear after a masquerade party. Are the events related? How the Hardy boys use all their courage and skill to outwit the criminals provides an exciting climax to one of the most baffling mysteries the young detectives have ever encountered.