Tree House Mystery & The Haunted Cabin Mystery — Gertrude Chandler Warner

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!