In The Book of Nightmares, helplessness must often appear--how terrifying to be aware and immobilized, lying entombed below ground as the earth thuds on your wooden coffin roof, unable to speak or scream. Or to live in the diving bell where the world around you is all ocean and movement, but you cannot join in: shiny slips of fish quicksilvering past as sharks bare sharp teeth jagged as bright coral reefs beside the long undulations…