Welcome to the most tumultuous summer of the 20th century. It's 1969, and for the Levin family, the times they are a-changing. Every year, the children have looked forward to spending the summer at their grandmother's historic home in downtown Nantucket. But like so much else in America, nothing is the same.

When Serenity Alston swabbed her cheek for a genetic test, she joked about uncovering some dark ancestral scandal. The last thing she expected was to discover two half sisters she didn’t know existed. Suddenly, everything about her loving family is drawn into question. And meeting these newfound sisters might be the only way to get answers.

After fleeing an abusive husband with her six-year-old son, Tommie, Beverly is attempting to create a new life for them in a small town off the beaten track. Despite their newfound freedom, Beverly is constantly on guard: she creates a fake backstory, wears a disguise around town, and buries herself in DIY projects to stave off anxiety. But her stress only rises when Tommie insists he’d been hearing someone walking on the roof and calling his name late at night.

When Mallory Blessing's son, Link, receives deathbed instructions from his mother to call a number on a slip of paper in her desk drawer, he's not sure what to expect. But he certainly does not expect Jake McCloud to answer. It's the late spring of 2020 and Jake's wife, Ursula DeGournsey, is the frontrunner in the upcoming Presidential election. There must be a mistake, Link thinks. How do Mallory and Jake know each other?

Carrie Soto is fierce, and her determination to win at any cost has not made her popular. But by the time she retires from tennis, she is the best player the world has ever seen. She has shattered every record and claimed twenty Grand Slam titles. And if you ask Carrie, she is entitled to every one. She sacrificed nearly everything to become the best, with her father, Javier, as her coach. A former champion himself, Javier has trained her since the age of two.

Still reeling from the sudden death of her mother, Jess is about to do the hardest thing she's ever done: empty her childhood home so that it can be sold. As she sorts through a lifetime of memories, everything comes to a halt when she comes across something she just can’t part with: an old set of encyclopedias. To the world, the books are outdated and ready to be recycled. To Jess, they represent love and the future that her mother always wanted her to have.

Single mom Ellen Fox couldn’t be more content - until she overhears her son saying he can’t go to his dream college because she needs him too much. If she wants him to live his best life, she has to convince him she’s living hers. So Unity Leandre, her best friend since forever, creates a list of challenges to push Ellen out of her comfort zone. Unity will complete the list, too, but not because she needs to change. What’s wrong with a 30-something widow still sleeping in her late husband’s childhood bed?

Bold and fearless, Nina Markova always dreamed of flying. When the Nazis attack the Soviet Union, she risks everything to join the legendary Night Witches, an all-female night bomber regiment wreaking havoc on the invading Germans. When she is stranded behind enemy lines, Nina becomes the prey of a lethal Nazi murderess known as the Huntress, and only Nina's bravery and cunning will keep her alive.

Irene Steele shares her idyllic life in a beautiful Iowa City Victorian house with a husband who loves her to sky-writing, sentimental extremes. But as she rings in the new year one cold and snowy night, everything she thought she knew falls to pieces with a shocking phone call: her beloved husband, away on business, has been killed in a helicopter crash. Before Irene can even process the news, she must first confront the perplexing details of her husband's death on the distant Caribbean island of St. John.

Samson and Beyah have nothing in common on the surface. She comes from a life of poverty and neglect; he comes from a family of wealth and privilege. But one thing they do have in common is that they're both drawn to sad things. Which means they're drawn to each other. Beyah and Samson agree to stay in the shallow end of a summer fling. What Beyah doesn't realize is that a rip current is coming, and it's about to drag her heart out to sea.