Murder on the Fourth of July is a Nancy Drew and Hardy Boys Supermystery novel.

Frank and Joe get to Seattle to inspect a case of sabotage among a fireworks factory during Independence Day, while Nancy Drew arrives at Seattle to participate in celebrations involving Orca Odyssey, an association devoted to the protection of whales, as well as solve the homicide filed against Ian O' Brien, a major benefactor. Realizing a connection, the three work together to find answers.