Tracy Letts’ “Mary Page Marlowe” at Second Stage offers a fascinating, fragmented portrait of one ordinary woman’s journey through life, embodied by six actors in eleven time-hopping scenes.  The tension of what happens to us versus what we control haunts the text as Mary Page traverses decades, surfing waves of feminism amidst the shifting roles of women from mid-century America to the present.  Mr. Letts, director Lila Neugebauer, and an ensemble cast of 18 create a mosaic that is compelling, if ultimately mysterious.