(Library of Congress description):
A ragged stranger and the prospect of losing her family's fortune lead Flavia Gemina and her friends, Jonathan, Lupus, and Nubia to a seaside villa where possible danger and treasure are close at hand.
Original title: The Dolphins of Laurentium
Genre: Fiction→ Children & Young Adult→ Mystery
Fiction→ Children & Young Adult→ Historical Fiction→ Europe→ Ancient World