Andi Boggs Books in Order

The Andi Boggs novels introduce younger readers to mystery through a smart, science loving twelve year old who copes with grief by throwing herself into puzzles from the past.

At the start of the series, Andora "Andi" Boggs and her older sister Bethany have just lost their scientist parents in a plane crash. The girls move to the small Ohio college town of Killdeer to live with their free spirited aunt Amelie in the longtime family home. It is a huge upheaval, and Andi’s curiosity and stubbornness become both coping tools and trouble magnets.

In Andi Unexpected, a search of the attic turns up a Depression era trunk labeled with Andi’s own name. Inside are mementos of another Andora Boggs, a relative no one seems willing or able to talk about. With the help of her new neighbor Colin Carter, Andi starts to investigate who this first Andora was, why she vanished from family history, and how her story fits into the town’s past. The mystery is rooted in the Great Depression and local history, giving young readers a sense of how personal stories intersect with larger events.

The second book, Andi Under Pressure, sends Andi and Colin to a science camp at the local university. What should be a dream week of experiments and lab time is disrupted by a series of escalating pranks that culminate in an explosion that injures their chemistry professor. Campus security zeroes in on an elderly janitor with a shadowy past, but Andi is not convinced. She and Colin dig into the history of the chemistry department, uncovering hidden guilt, old accidents, and someone who is willing to go too far to keep the past buried.

In Andi Unstoppable, the duo takes on a mystery involving a local legend and strange happenings around the town’s railroad tracks and wooded ravines. Rumors of a ghost train, environmental concerns, and a push to shut down a favored hiking area collide, and Andi finds herself trying to protect both a fragile ecosystem and the people she loves.

Throughout the series, Flower keeps the tone age appropriate without talking down to her readers. The books deal openly with loss, change, and ethical choices, but they do so through quick chapters, relatable friendships, and satisfying clues. Andi herself is a memorable heroine: impulsive, brave, sometimes prickly, and always willing to ask one more question. These stories work well as read alone adventures or as a sequence for middle grade readers who are ready for mysteries with real emotional weight but no graphic content.