In this Hardy Boys Secret Files mystery, a missing bass guitar causes a few wrong notes at the Battle of the Bands. Frank and Joe are thrilled to learn that the popular band, Crush, is scheduled to perform in Bayports huge Battle of the Bandsand even more excited when they find out that their friends brother, Dylan, is the bass guitarist. But on the day of the performance, Dylans prized guitar has gone missing! Could someone from a rival band have taken it in hopes of gaining an advantage? Or could the culprit be someone closer to home? Its up to Frank and Joe to investigate this rocking mysteryor else Crush might be crushed in the competition!