In this follow-up to her acclaimed 2007 novel The Bastard of Istanbul, Turkish author Elif Shafak unfolds two tantalizing parallel narratives-one contemporary and the other set in the thirteenth century, when Rumi encountered his spiritual mentor, the whirling dervish known as Shams of Tabriz-that together incarnate the poet's timeless message of love. Ella Rubenstein is forty years old and unhappily married when she takes a job as a reader for a...