Iris has had a long, complex friendship with Walter. Walter is an irresistible charmer, a brilliant author, a lover of many women, and a master at letting down loved ones. When he dies suddenly, Iris is left to deal with all he left behind — three ex-wives with unfinished business, his interrupted literary legacy, and his beloved beast Apollo. It's not that Iris doesn't like dogs, but this is Manhattan, and she’ll get kicked out of her building if they find out she’s pretty much trying to house a horse.

A father and daughter accidentally hit and kill a unicorn while en route to a weekend retreat, where his billionaire boss seeks to exploit the creature’s miraculous curative properties.