Fellowship Point by Alice Elliott Dark

The masterful story of a lifelong friendship between two very different women with shared histories and buried secrets, tested in the twilight of their lives, set across the arc of the 20th century.
Celebrated children's book author Agnes Lee is determined to secure her legacy-to complete what she knows will be the final volume of her pseudonymously written Franklin Square novels; and even more consuming, to permanently protect the peninsula of majestic coast in Maine known as Fellowship Point. To donate the land to a trust, Agnes must convince shareholders to dissolve a generations-old partnership. And one of those shareholders is her best friend, Polly.

Polly Wister has led a different kind of life than Agnes: that of a well-off married woman with children, defined by her devotion to her husband, and philosophy professor with an inflated sense of stature. She exalts in creating beauty and harmony in her home, in her friendships, and in her family. Polly...

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