 Champion race car driver Alex Pareno arrives in Hawaii to attempt to break the record for driving up Tantalus Mountain. However, his chief mechanic is bludgeoned to death after catching someone tampering with Pareno s car. Later, a second mechanic is killed while test driving the car. McGarrett eventually discovers plenty of suspects ranging from Pareno s fiancée Angela, who was being blackmailed by an ex-lover, to Pareno himself. However, it is eventually discovered that the killer is someone very close to Pareno.