Books with author Millie Garnepudi

15 year-old mystery lover, Natalie Prior, finds herself wrapped up in a difficult case while on a school residential trip to Washington D.C. A rare and precious diamond is hidden deep inside a wrecked mansion. It's up to Nat and her new friend Nathan to find the diamond before a criminal on the loose gets to it first. It's a race against time, but who will be the winner?