Merril has been spending more time with her sister, Angie, but she isn't ready for anyone to know about it. At least, not until Merril has decided that Angie is ready to see other people - but it is going to take a little more finessing, and definitely less fighting. After Angie, without permission, arranges for Merril’s ex Raquel to come over, the truth comes out: Angie is an A.I. creation that Merril has developed to cope with her sister's death. But as the virtual Angie begins to demand more presence in Merril and her mother’s lives, reality and consciousness blur, and new moral questions arise about the right, safe, and acceptable ways to grieve.