One summer. One cabin on a lake. Four thirtysomething sisters. Anything can and does happen. Samantha McGreggor, a thirtysomething eco-journalist, trades Arizona's summer heat for Minnesota's cool lake breezes by spending her summer at the same resort her family used to go to when she was young. She envisions relaxing days filled with fishing, boating, and bathing in the sun. More importantly, she hopes for late-night soul-searching talks with her three grown sisters. However, she and her sisters haven't been back to the resort since their parents' death twenty years ago, when they were all practically teenagers. She soon remembers that when they're all together, they still tend to act like emotional teens. Will her "fun-in-the-sun" summer turn out as she hoped? Or will secrets and sibling rivalries ruin her picture-perfect "McGreggor Girls" reunion? Jake Hunter, the resort owner, has his hands full running the resort, while keeping his handsome cousin Vince out of trouble. What happens when these two families meet? Find out when Sammy has a summer of firefly memories.