Two sisters couldn’t be more different. Win organized and responsible; Poppy impulsive and undependable. Win treads cautiously and plans her life with care; Poppy bounces from job to job and apartment to apartment, leaving others to pick up the pieces. But despite their differences, they share memories of the idyllic childhood summers they spent together on the shores of Butternut Lake. Now, 13 years later, Win, recovering from a personal tragedy, has returned to Butternut Lake, settling into a predictable and quiet life.

Then, one night, Poppy unexpectedly shows up on Win’s doorstep with all her worldly possessions and a mysterious man in tow. And although Win loves her beautiful sister, she wasn’t expecting her to move in for the summer. Still, at first, they relive the joys of Butternut Lake. But their blissful nostalgia soon gives way to conflict, and painful memories and buried secrets threaten to tear the sisters apart.

As the waning days of summer get shorter, past secrets are revealed, new love is found, and the ties between the sisters are tested like never before…all on the serene shores of Butternut Lake.