The Ancestors' Key. The Evers Series, #1

A mysterious key. A hidden world. A destiny she never asked for. After her mother's sudden death, seventeen-year-old Lola is forced to move across the country to live with an aunt she barely knows. Leaving behind her friends and everything familiar, she expects a lonely final year of high school. Instead, she discovers a secret. Hidden in her aunt's house is an ancient key - and a door that doesn't lead where it should.
When Lola unlocks it, she stumbles into a hidden network of Travelers, people who can cross between worlds through magical doors scattered across the globe. And the key she's found may be far more powerful than anyone realizes. But powerful artifacts attract dangerous attention. As Lola begins to uncover the truth about her family and the mysterious Travelers, she learns that mastering the key may be the only way to protect the worlds beyond the door.
And soon she'll be sent to the Academy, where Travelers are trained. If she survives long enough to get there. Perfect for fans of portal fantasy, magical academies, and hidden worlds, The Ancestors' Key is the first adventure in the Travelers Universe.