His grandmother Katharine has rushed into a wartime marriage with handsome and charming Frederick Merrill but there is another side to the man, as she soon discovers.
Alcohol abuse, infidelities, peculiar public behaviour: she suffers in silence. Then Frederick is arrested one night for drunkenly flashing at motorists and, with her family's support, she commits him to high-end Boston mental asylum the Mayflower for the "rest" he needs.
The depiction of Frederick's period of incarceration is vivid and utterly involving. Surrounding by crazed mutterers and deranged geniuses he struggles to come to grips with his own instability and to find a way back to the world. Meanwhile Katharine is at the family's lakeside summer cottage trying to keep up appearances and wondering why life is not as perfect as it should be.
This is a story of love gone wrong. It turns the minds of its characters inside out and shows the ragged seam between sanity and madness. Each chapter is prefaced by pictures of the pair - Frederick wearing his naval uniform and Katharine got up in her best fur, both impossibly young and hopeful, which adds to the poignancy.
At some points, almost documentary in style, Block's attempt to understand what his grandfather went through and how his grandmother coped has been informed by interviews with their surviving acquaintances and his reading about mental health institutions and manic depression.
His genius is in the way he brings alive all this information and fills in the gaps with fiction.
So why air so much of his family's dirty laundry? For Block it seems to be a bid to understand his own periodical "strangeness". Has he inherited more from his grandfather than his intellect and writing talent? Is this a mental illness or just the way he is?
This Texas-born author is only 29 and perhaps that explains his unrestrained passion for words. At his hands, the dictionary gets a thorough working over.
As I read I wished he'd pared things back as sometimes the language obscures when it ought to illuminate what is a sensitive and haunting story.