Adam Rapp's new novel 'Know Your Beholder' is a comic masterwork
His mom has died from cancer. His wife has left him for another, more promising man and for a hip, new life in New York City. His on-the-verge indie rock band has imploded. Francis Falbo hasn't left his house, or bathrobe, in almost a month. And, as they like to say in "Game of Thrones," "Winter is coming." It's more than a warning. It's an emotional death threat in Adam Rapp's "Know Your Beh…