Earl Derr Biggers (Aug 26, 1884 – Apr 5, 1933) was an American author of plays and novels. Some of his writing, both theatrical and detective, had movie adaptations. He also worked as a journalist for The Plain Dealer prior to his fiction writing career. His most notable work is a series of detective novels featuring Officer Charlie Chan, an American with Chinese roots and a real-life prototype. Keeper of the Keys is detective novel by Earl Derr Biggers. The story is set in Californian countryside, where Officer Charlie Chan was invited as a guest. But evil is never idle, even when a detective has a day off. Chan met Ellen Ladona, a soprano with world-wide fame. And soon after he learns of her murder. The crime is committed, suspects are in place, clues are found – detective Chan has everything a detective might need to solve a murder. Will it be a piece-of-cake case, things are not what they seem? Read and find out!