When Caroline wakes up in a Paris hospital with no memory of her past, she’s confused to learn that for years she’s lived a sad, reclusive life in a sprawling apartment on the rue Cler. A budding friendship with the chef of a charming nearby restaurant takes her mind off her foggy past, as does a startling mystery from decades prior. In Nazi-occupied Paris, a young widow named Céline is trying to build a new life for her daughter. Then a ruthless German officer discovers her Jewish ancestry, and Céline is forced to play a dangerous game to secure the safety of her loved ones. When Caroline discovers Céline’s letters tucked away in a closet, she realizes that her apartment harbors dark secrets --- and that she may have more in common with Céline than she ever could have imagined.

Enjoying a romantic candlelit dinner with her fiancé, Ryan, Kailey Crain can’t believe her good fortune: She has a great job as a journalist and is now engaged to a guy who is perfect in nearly every way. As she and Ryan leave the restaurant, Kailey spies a thin, bearded homeless man on the sidewalk. She approaches him to offer up her bag of leftovers, and is stunned when their eyes meet: The man is the love of her life, Cade McAllister. Over the next few weeks, Kailey helps Cade begin to piece his life together, something she initially keeps from Ryan. As she revisits her long-ago relationship, Kailey realizes that she must decide exactly what --- and whom --- she wants.

Born during a Christmas blizzard, Jane Williams receives a rare gift: the ability to see true love. Jane has emerged from an ailing childhood a lonely, hopeless romantic when, on her 29th birthday, a mysterious greeting card arrives, specifying that Jane must identify the six types of love before the full moon following her 30th birthday or face grave consequences. When Jane falls for a science writer who doesn’t believe in love, she fears that her fate is sealed.

June Andersen is professionally successful, but her personal life is marred by unhappiness. Unexpectedly, she is called to settle her great-aunt Ruby’s estate and determine the fate of Bluebird Books, the children’s bookstore Ruby founded in the 1940s. Amidst the store’s papers, June stumbles upon letters between her great-aunt and the late Margaret Wise Brown --- and steps into the pages of American literature.

Fleeing an East Coast life marred by tragedy, Ada Santorini takes up residence on houseboat number seven on Boat Street. She discovers a trunk left behind by Penny Wentworth, a young newlywed who lived on the boat half a century earlier. Ada longs to know her predecessor’s fate, but little suspects that Penny’s mysterious past and her own clouded future are destined to converge.