A whipsawing stock market has been keeping many of us busy—along with June’s weddings and graduations. While the unceasing rain in much of the country has meant more time for reading, it also delayed the start of summer. Now, though, with the prospect of sunnier days and more leisure time ahead, here's a chance to expand your reading list with some notable new books that our writers and contributors have enjoyed—including business reads and titles for relaxation.