The Mystery of the Invisible Dog — M.V. Carey

Terror strikes an entire apartment house!

Ever since the statue of a phantom wolf-dog was stolen, things have gone wrong at Paseo Place. A creepy shadow that passes through walls haunts one apartment. A fire breaks out in another. The ghost of a priest long dead appears.
Who is frightening the helpless tenants? Are supernatural forces at work? The Three Investigators must find out -- before everyone is driven from their homes!