Mystery at the Biltmore: The Vanderhoff Heist (Mystery at the Biltmore, 1)
by  Colleen Nelson (Goodreads Author), Peggy Collins (illustrator)

4 out of 5 stars

Elodie decides to start a detective business, and she gets her first big case when some valuable earrings are stolen. She is joined by her dog, Carnegie, and her new neighbor, Oscar, who loves tumbling and acrobatics. Most adults don’t take a child detective seriously, but Elodie is determined to prove herself. She follows the clues and regards everyone as a suspect, but all the neighbors are so nice. None of them would steal the jewels… would they?