The characters Meg, Charles Wallace, and Calvin first appeared in A Wrinkle in Time (1962, ISBN 0-374-38613-7). Unlike some of the other books in the series, A Wind in the Door focuses on the same three protagonists. They and their families collectively appear in a total of eight books, four about the Murry family (the Time Quartet) and four about the eldest of the O'Keefe children a generation later. The Time Quartet plus the last of the O'Keefe books, An Acceptable Time, are marketed as the Time Quintet.
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