A person can’t be reconciled. A thirst for freedom can’t be destroyed. That is the main theme of a science-fiction novel that was once incredibly popular, but is hardly known to the modern domestic reader—by Jack London. The hero, declared insane, actually has a remarkable gift: the power of will to leave his physical body and wander through the most distant epochs and countries. He doesn’t need a time machine—he himself is the time machine. The frail flesh may languish behind bars, but what does it matter, if the mind and spirit are free?…