- Series: O'Keefe Series Record # 12088
- Sub-series of: Kairos
- Webpages: Wikipedia-EN
- Series Tags: young-adult time-travel (1), young-adult sf (1), mystery (1), Portugal (1)
- O'Keefe
- 1 The Arm of the Starfish (1965) by Madeleine L'Engle
- 2 Dragons in the Waters (1976) by Madeleine L'Engle
- 3 A House Like a Lotus (1984) by Madeleine L'Engle
- 4 An Acceptable Time (1989) by Madeleine L'Engle
- The Polly O'Keefe Quartet (2018) [O/1-4] by Madeleine L'Engle