Guest Stars Tess Atkins as Sydney Jared Gertner as Len Fletcher Co Starring Yasmeene Ball as Teenage Amara Claude Knowlton as Detective Madsen Emily Haine as Wendy Glynis Davies as Mrs. Kemper Finn Wolfhard as Jordie Pinsky Tracey Power as Dawn Pinsky David Lennon as Wendy's Boyfriend Thomas Jones as Mason Kemper