Brother detectives Frank and Joe face the dangers of Black Bear Mountain once again in the twentieth book in the thrilling Hardy Boys Adventures series.
And so th.
K is a fan of living off the grid, but he\'s been MIA long enough to cause worry in the small Mountain town.
Dr.
K, a friend they made during their first trip.
This time, the brothers are checking in on Dr.
Frank and Joe are back on Black Bear Mountain, the scene of a previous wilderness adventure and mind-bending mystery.
Brother detectives Frank and Joe face the dangers of Black Bear Mountain once again in the twentieth book in the thrilling Hardy Boys Adventures series