After failure after failure, the Hardy Boys go to a strange drilling site and find the Infinity clue there too. While staying at camp, they witness a boat disguised as carrying oysters passing by. The Hardy Boys witness strange flashes and go to the source to investigate.
The Hardy Boys faced numerous setbacks before discovering the Infinity clue at a peculiar drilling site. During their stay at camp, they observed a suspicious boat disguised as carrying oysters sailing past.  They also witnessed strange flashes that led them to investigate their origin.