A fatal inversion

In the long hot summer of 1976, a group of young people are camping in Wyvis Hall. Adam, Rufus, Shiva, Vivien and Zosie hardly ask why they are there or how they are to live; they scavenge, steal and sell the family heirlooms. In short, they exist. Ten years later, the bodies of a woman and child are discovered in the Hall's animal cemetery.