Consumed by questions of her grandfather's fate and the intoxicating world of Baumgaertner, Amy exists increasingly in a world of her own. The relationship between Deborah and Maurice is further deteriorating and Shun is caught between the warring couple. Plumber Donald is delighted to be asked round to Matilda's, where a blocked sink calls for the deployment of his special Machine. Maurice goes on a bender with Amy's friends, with Donald forced to play chaperone. Deborah focuses her attention on a reading of her self-help book, in which Amy finds a clue that feels like it could just unravel the entire mystery of her grandfather Felix.

As the dust settles from events of the last few days, the family find themselves back together at the house for the first time in a while. Deborah and Maurice slip back into their roles as mother and father, for the good of their children, while Donald struggles to come to terms with the fact that his twin sister Amy, like his Dad, might be suffering from a mental illness. Amy is determined to get ready for The Pink Cuttlefish Orchestra's scheduled concert in Omsk, but she crashes down into a depressive state and finds herself exhausted and at a loss. Amy summons the last dregs of her energy to perform, for no one but Hylda, a piece that she has inadvertently written about her own struggle with mental illness. Shun revisits the forest where he once encountered the ghosts of his dead family.