Into Thin Air

When Daisy Rodriguez, the daughter of an amusement park owner, vanishes without a trace, it's anything but fun and games. Her father, Hector Rodriguez, is desperate, especially since his park was recently the site of another disappearance. Brothers Frank and Joe Hardy, who solved the previous mystery, find themselves embroiled in this new case. With no apparent enemies, the boys must uncover who in Bayport wants Daisy gone.