Curse of the Crystal Ball - Crystal Ball Series, #1

Waylon Cook, an adventurer with a passion for the occult and ancient ruins, is sitting in his slightly messy workroom. The sun is shining through the gaps in the window and lazily illuminating the desk, which is piled high with books and maps. His deep eyes are full of curiosity and anticipation, as if waiting for an upcoming adventure. Suddenly, a knock on the door interrupts the tranquillity of the room.
Waylon gets up and opens the door. A postman in uniform hands him a thick letter. He takes the letter and a strange feeling wells up in him, as if there is an unknown world hidden in the letter. Back at his desk, Waylon carefully opened the envelope. The paper had a faint, old-fashioned scent, and the handwriting was bold and mysterious: "Dear Mr Waylon, I hear you are passionate about exploring the unknown.
Deep in an abandoned factory, there is a secret that could shake the world. If you have the courage, come and find out."