When the brilliant young painter Marianne Glass is found dead in her snow-covered Oxford garden, her closest friend, Rowan Winter, knows it wasn't an accident. Rowan's pursuit of the truth takes her into every corner of her friend's life, from Bohemian east London to the professional art world, in which Marianne made her name. The deeper she goes, Rowan discovers some secrets are better left uncovered and others can be lethal…