An Acceptable Time

An Acceptable Time is a 1989 young adult science fiction novel by American author Madeleine L'Engle, the last of her books to feature Polyhymnia O'Keefe, better known as Poly or Polly. Marketed as part of the author's Time Quintet, An Acceptable Time connects Polly's adventures with those of her parents, Meg Murry and Calvin O'Keefe, which take place a generation earlier. The book's title is taken from Psalm 69:13, "But as for me, my prayer is to You, O Lord, at an acceptable time."