Is reality based entirely on chemical reactions in our brain?
Maddie and Lindsay interview chemical expert Ryan Stoncram, who may have an answer as well as a sweet deal.
Perhaps talking to the people who were closest to Ashley will shed light on the mystery of her disappearance, but trying to find Bethany leads to Tewa Ansari and more questions than answers.
An unexpected caller from the past adds a further layer of tension and confusion to the quest.