From School Library Journal
Grade 3-5 Third in the series, The Phantom of the Operetta is not a particularly challenging, intriguing, or believable mystery. Fenton P. Smith and his partner, Gerald Grubbs, set out to find the loot hidden by a recently released bank robber. Before they can begin to solve that mystery, the boys become involved in ferreting out a ghost that haunts an old house being used to stage an amateur opera production. Both problems are too easily resolved without involving readers.
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