The series, authored by Thomas Lockhaven , is a middle-grade mystery collection featuring twelve-year-old best friends Ava Clarke and Carol Miller . These "whip-smart" protagonists solve global and local mysteries using a combination of forensic skills, humor, and teamwork. Core Characters

: The duo investigates stolen gemstones from a museum in their hometown of Livingston, Massachusetts.

: Stories often integrate real-world investigative tools, such as mobile apps, the internet, and hidden cameras.

: Set in Tempest, Maine, the girls explore the home of a rumored witch.

: One half of the detective duo. She and Carol discovered their talent for investigation after catching thieves at their middle school.

The series is often available in bundles (Books 1–3, 4–6, and 7–9). The primary reading order is as follows:

: The series is frequently compared to classics like Nancy Drew , the Hardy Boys , and the Boxcar Children for its fast-paced, "rip-roaring" adventure style. Ava & Carol Detective Agency (Books 7-9)

: The team travels to the Amazon Rainforest to face poachers.

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