Absurd Incredulity. Inconceivable Calamity

Absurd-The Definition: Of a thing: against or without reason or propriety; incongruous, unreasonable, illogical.-Oxford English Dictionary

Incredulity-The Definition: A disbelieving frame of mind; unreadiness or unwillingness to believe (statements, etc.); disbelief.-Oxford English Dictionary

Inconceivable-The Definition: That cannot be conceived or realized in the imagination; unthinkable, unimaginable, incredible.--Oxford English Dictionary

Calamity-The Definition: A grievous disaster, an event or circumstance causing loss or misery; a distressing misfortune.-Oxford English Dictionary

I realize this isn't the most elucidating synopsis, but, when the book, in this case, a novel that has very dark humor, is brimming with unpredictable, disconcerting lunacy and potentially catastrophic repercussions, it can be difficult to describe without giving away important details that are integral to the story and better served being revealed at the proper time.