Writer and director Bryce McGuire's Night Swim, based on the 2014 short film of the same name, follows Ray Waller (Wyatt Russell), a pro baseball player forced into early retirement after being diagnosed with Multiple Sclerosis. Along with his wife, Eve (Kerry Condon), teenage daughter Izzy (Amelie Hoeferle), and young son Elliot (Gavin Warren), the family relocates to a new home with an underground swimming pool that will provide physical therapy for Ray and recreational entertainment for the kids.
Source:https://www.cbr.com/night-swim-bryce-mcguire-interview/