Private Killer: Book Two in the Killer Mystery Trilogy (Hardy Boys Undercover Brothers Series #32)

In Private Killer, Frank and Joe continue their undercover investigation of Gamma Theta Theta, a mysterious-turned-dangerous fraternity at an all-boys New England boarding school. The headmaster’s meddlesome, trouble-making daughter is in danger, and it seems like the fraternity members—and even some faculty—will stop at nothing to protect their secrets.