Jewel Thief

The year is 1952, and when 12-year-old Elizabeth Murgatroyd discovers royal jewels hidden in her Uncle's attic, she suddenly finds herself thrust into a challenging mystery, just like one of her books...
A story full of new experiences, lifelong changes, action, and excitement. Join Elizabeth as she, along with her older sister, Maddie, move to America, go to school for the first time, have to live in a house with their uncle Henry (who doesn't like children), and all the while have to solve a mystery that they accidentally stumbled upon on their first night in Henry Murgatroyd's house.
Not to mention the fact that their parents died in WW2.