The classic boy detectives by Frank Dixon--I read ALL of them in my younger years, one I ran out of Nancy Drew books. The Hardy Boys are brother amateur detectives, aspiring to follow in their famous father's footsteps. Frank Hardy is the elder of the two and has dark hair. Joe Hardy is the younger brother, and has blond hair and blue eyes. The stories are an unaging series, in which Frank and Joe are always 18 and 17 years of age, respectively. In the original series the brothers were a younger 16 and 15 years of age, but their ages were increased during the revision process that began in 1959. The series utilizes a "floating timeline", in which events always take place in the present day.The two boys live in the fictional city of Bayport (on Barmet Bay) with their famous father, Fenton Hardy, a private detective formerly with the New York Police Department, their mother Laura Hardy (erroneously called Mildred in The Flying Express), and their Aunt Gertrude, a character often used for comic relief.
The mark on the door is a story by Frank Dixon that involves Mexican beliefs in bad luck and stuff. the Hardy's investigate vanished workers of a small Mexican town. A strange symbol is marked on the doors of those who were gone. The Hardy's travel around the area to find the missing people. Eventually they stumble upon a cave with the prisoners inside. But, the brothers get captured too. The Hardy's escape from the help of their chubby friend. The group teams with the police to unexpectedly catch the evil Mexican gang. They successfully arrest all of them and free the Mexican prisoners. The Hardy's are rewarded once again and go on a spending spree.
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I give this book five out five stars because of its great plot and smooth transitions between chapters. It was super easy to understand what was happening and you really get to know the characters the more you read along. I personally love the Hardy Boys series and am slowly working my way up reading all 56 books. If you are not familiar with this series, the Hardy Boys are brothers who solve all types of mysteries. The end of every book makes you want to read more and see more of their crazy adventures (that's why the made 56 books). All in all, this book is very much worth reading and I almost guaranty you that you will not be disappointed.
—Jacob