Tree House Mystery Henry, Jesse, Violet, And Benny Alden Have New Neighbors, And They’re All Building A Tree House! From Up High The Aldens Can See A Strange Round Window On The House Next Door—but Nobody Can Find The Window Form Inside The Attic. Does Their Neighbor’s Old House Have A Secret? Join The Boxcar Children In Their Graphic Novel Adventure As They Find Out The Truth! The Haunted Cabin Mystery Henry, Jesse, Violet, And Benny Alden Take A Trip Down The Mississippi River And Stay In A Haunted Cabin! At Least It Seems Haunted—there Are Spooky Phone Calls, Flickering Lights, And Strange Shadows. Is There A Ghost In The Cabin? Join The Boxcar Children In Their Graphic Novel Adventure As They Solve The Mystery Of The Haunted Cabin!