The twins have trouble falling asleep. Their mother shares a story she was told, by her mother, as a child. The twins learn of the 'Invisible String'.
The "Invisible String" written by Patrice Karst is read by the Frederick family. This is the final episode (4/4) of the "Stories for Advent" series. 
Music from Youtube Music Library: "Fairy Tale Waltz" written by Kevin MacLeod
FairyTale Waltz by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 license. https://creativecommons.org/licenses/by/4.0/

Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100232

Artist: http://incompetech.com/