From her early, tightly-structured poetry written in England to her more Americanized verse, which spanned the latter half of her life in the United States, Levertov's creative work is some of the most well respected, highly praised to come out of the twentieth century in both countries. While some critics cast doubts about her liberal delving into political poetry in the 1960s and early 1970s, even this work grabbed attention, if more so for its controversial subjects and accusatory tones than pure poetics. In the final two decades of her life, Levertov settled into quieter, more spiritual themes, essentially bringing to the front the religious beliefs and contemplations on God that many critics saw lurking in the background of her earlier work as well. Her "middle" collections—those published in the late 1970s and early 1980s—are transitional, revealing the mellower tone and meditative spirituality, yet...