Breathing Underwater was Flinn’s first novel. It was originally published in 2001 and was chosen a Top 10 ALA Best Books for Young Adults for that year. It tells the story of 16-year-old Nicholas Andreas, a wealthy Miami teen who is sent to anger management because his girlfriend, Caitlin, takes out a restraining order against him. Ordered by the judge to write about his relationship, Nick tells of falling in love with her, and the eventual time when his anger took over and he hit her. Flinn based the book in part on her experience as a lawyer working with domestic violence cases. The book is set in Miami and Key West, Florida. An excerpt from the book was included in Liz Claiborne, Inc’s Love is Not Abuse curriculum, which was formulated to teach students about dating violence. Diva, a sequel to Breathing Underwater was released in 2006. It tells the story of Caitlin attending performing arts school as she gets over what happened between her and Nick and learns to be her own person while bonding with her often-flighty mother.

Breaking Point, Flinn’s second novel, was published in 2002. It was a Quick Pick for Reluctant Young Adult Readers. It deals with school violence and bullying. In it, Paul Richmond, who has trouble fitting in at a private school where his mother works as a secretary. People at school pick on him. Then, Paul meets Charlie, a more popular boy who seems to be Paul’s ticket to fitting in. However, Charlie pressures Paul to commit acts of vandalism and break into the school and change his grade. Then, he asks him to do something more shocking.

Many of her books have made the American Library Association Best Books for Young Adults lists, as well as Quick Picks for Reluctant Young Adult Readers. They have also received such teen-selected honors as the International Reading Association Young Adult Choices list (Breathing Underwater, Nothing to Lose, and Fade to Black). Flinn’s books seem to appeal to teens who might otherwise prefer not to read, which is the charge of the Quick Picks for Reluctant Young Adult Readers list. Her books has also been nominated for numerous state awards. Breathing Underwater won the Maryland Black-Eyed Susan Award in 2004. Beastly was nominated for the 2009 Lone Star State (Texas) Award and recently won the teen-selected Detroit Public Library Author Day Award.

A Kiss in Time was released in 2009. A Junior Library Guild selection for 2009, the novel is a modern version of Sleeping Beauty, in which Talia, princess of Euphrasia, touches a spindle, falling into a deep sleep for three-hundred years. She wakes to the kiss of an American boy named Jack, on a tour of Europe. Since everyone in her kingdom is angry at her for touching the spindle, she persuades Jack to take her back to his Miami home, where she enters a modern world, replete with South Beach models and Jell-O shots. A humorous fish-out-of-water romance, Booklist magazine said in their review that “fans of Meg Cabot’s Princess Diaries and Gail Carson Levine’s Ella Enchanted (1997) will embrace this charming, lightweight fantasy.” Publishers Weekly called the book, “clever and humorous,” while Horn Book Magazine called it “satisfying.”

This book is written as a diary showing the events of Beastly from Lindy’s perspective, along with a few extra things. This was an original e-book and was also published as part of a special edition of Beastly in 2011.

Cloaked is a melange of several fairy tales, including The Frog Prince, The Shoemaker and the Elves, and The Six Swans. Set in Miami, it tells the story of a teen who works at the shoe repair counter at a posh South Beach hotel until he is sent on a quest by a princess, whose brother has been turned into a frog by a witch and set loose in the Florida Keys. He goes on a long journey to find the frog but he finds the frog It was released on January 26, 2011.

Bewitching, published in 2012 is another story involving Beastly’s witch, Kendra. It begins with Kendra’s original family and we get to see when she found out she was a witch. Then we see the story of Emma and follow her as we learn about her stepsister, who turns out to be manipulative. Kendra tries to help, but as usual, magic can sometimes be unpredictable.

Towering is a retelling of Rapunzel, set in frozen Upstate New York. It is in two viewpoints, Wyatt, a teen who moves from Long Island after a tragedy, only to hear a strange voice, calling him into the wilderness, and Rachel, a girl who is locked in a tower. When the two meet, they begin to solve the mystery of why each is there. It was released in 2013.

Flinn’s Mirrored is a retelling of Snow White, set in Miami Florida in the 1980s and the present day. It begins with the tale of Violet, a friendless, homely girl who discovers she has magic powers and uses these powers to acquire beauty. The tale continues in the present day with Celine, Violet’s stepdaughter, who is more beautiful than she and the object of Violet’s envy and wrath. The third viewpoint character is Goose, a little person who falls in love with Celine and tries to help her. Like Flinn’s previous books, Beastly and Bewitching, Mirrored features the witch, Kendra. It was published on September 15, 2015.

Flinn’s Beheld was published in 2017. Like Bewitching, it deals with the witch, Kendra. It includes stories based upon several fairy tales, including Little Red Riding Hood, Rumpelstiltskin, East of the Sun and West of the Moon, and The Ugly Duckling. All the stories are set in different historical eras and locations, such as the Salem Witch Trials, World War II London, and the present day. It follows the love affair between Kendra and a wizard named James, whom she met in Salem.

Flinn’s Girls of July was published in 2019. It’s about three girls who rent rooms in a upstate lake house of a grandmother and her granddaughter for the month of July. Kate is a southern belle, escaping her father’s legal troubles; Britta is a theater performer, escaping her mother’s creepy boyfriend; Meredith is an honor student, looking for a place to write her college essays. The grandmother, Ruthie, is a theater legend and flower child. The granddaughter, Spider, is a wannabe film director. They bond and grow over the summer.