Award-winning playwright and screenwriter Abi Morgan (The Iron Lady, Suffragette) tests the bond between parent and child in a six-part thriller set in 1980s New York. Vincent Anderson (Benedict Cumberbatch) is the creator of the hugely popular children's TV show Good Day Sunshine and one of the puppeteers that brings the colourful cast to life. Away from the bright lights, he is devoted to his wife Cassie (Gaby Hoffmann) and eight-year-old son Edgar (Ivan Morris Howe). The boy disappears on the walk to school one morning and Detective Michael Ledroit (McKinley Belcher III) leads the high-profile police investigation. Vincent fixates on Edgar's drawing of a blue monster puppet named Eric and clings to the idea that creating Eric for Good Day Sunshine will somehow convince the missing child to return home. As the father's progressively destructive behaviour alienates everyone around him, Detective Ledroit races against time to locate Edgar and reunite the Andersons