At 3 years old, twins June and Jennifer initiate a lifetime of creepy behaviors. They create their own language to communicate exclusively with each other and span decades without speaking to another human. The girls obsessively mirror their behaviors, even inhaling and exhaling simultaneously. Eventually, a mysterious death leaves us with more questions than answers.
Sources:
https://thenetline.com/june-gibbons-now/
https://allthatsinteresting.com/silent-twins
https://en.wikipedia.org/wiki/June_and_Jennifer_Gibbons
https://www.theguardian.com/books/2007/jun/28/fiction.classicalmusicandopera
https://www.npr.org/2015/05/08/405191622/the-silent-twins
Leigh's science publication:
https://www.nature.com/articles/s41389-023-00477-z