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In page Troubling a Star:

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Troubling a Star (ISBN 0-374-37783-9) is the last full-length novel in the Austin family series by Madeleine L'Engle. The young adult suspense thriller, published in 1994, reunites L'Engle's most frequent protagonist, Vicky Austin, with Adam Eddington, both of whom become enmeshed in international intrigue as they travel separately to Antarctica.[citation needed] The story takes place several months after the end of A Ring of Endless Light, the novel in which Vicky and Adam first met.