The Three Investigators, Voices from Nowhere

"My sister wants to drive me to my death!" The old lady sitting next to Justus in the waiting room is on the verge of a nervous breakdown. The First Detective senses a new case for the Three ??? and offers his help. But what he then learns makes him turn pale. The voices threatening Mrs. Holligan apparently come from the afterlife, because her supposedly murderous sister was buried three months ago. Justus, Peter, and Bob must hurry to solve the case. Mrs. Holligan has a serious heart condition; every new attack could end her life. But who is really behind the mysterious voices?

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