When Jessica Chastain first read the script for “Memory,” she was struck by the flurry of unanswered questions left swirling around in her head about issues pertaining to love, sex and consent. It was writer and director Michel Franco’s willingness to probe gray areas and leave questions unanswered that ultimately persuaded Chastain to star in “Memory,” in select theaters now with a nationwide release set for Friday. “Memory” follows Sylvia (Chastain), who is hired by the family of a man named Saul (Peter Sarsgaard) to keep him company as he navigates early onset dementia. Although her background in caretaking is a plus, Saul’s family mostly wants someone to spend time with him — until Sylvia is suspected of developing romantic feelings for Saul. (Jan. 3)