Mystery Back of the Mountain — Mary C. Jane

When an uncle leaves his old Maine house to the Ward family, Anne and her brother Stephen find they have walked straight into a mystery. The puzzle has its roots in the disappearance of a beautiful girl long in the past. When a valuable portrait is taken from their house and they hear strange howlings in the night, Anne -- who has never been able to keep up with her brother -- proves her own ingenuity in helping to find the solution to the mystery.