After her son dies in a terrible accident, Arlene loses everything, including her husband and home, and she starts to go crazy. When the mysterious Endeavour Institute gives her a chance to go back in time and change things, she jumps at the chance. Arlene can't stop thinking about her other life, so she has to figure out what's real and what's not without upsetting the delicate balance. She didn't expect that saving her son would cost her so much.