“ Shakti ,” the debut narrative feature from filmmaker Nani Sahra Walker, will make its digital bow on Prime Video across the U.S. and U.K. on May 22, with a trailer unveiled ahead of the launch. Buffalo 8 handles distribution. The film unfolds in Kathmandu, where a mother races to shield her nine-year-old daughter from a sudden and troubling change – a journey that forces both characters to reckon with trauma and with a legal system ill-equipped to deliver justice. At its center, the story takes aim at Nepal’s time limits on prosecuting sexual violence, reflecting wider pressure for legislative accountability. Walker’s prior credits include the documentary “Other Nature,” which she directed, and the Academy Award-winning short “The Last Repair Shop,” on which she served as executive producer.…