Leena Katriina Lehtolainen is a Finnish crime novelist, best known for her series of novels about the policewoman Maria Kallio. Lehtolainen was born in Vesanto, Northern Savonia. Her first novel was released when she was only 12 years old. She studied literature in Helsinki until 1995 and wrote crime novels from 1993 on. Since about 2007 she has written other genres of books. Her works have been translated into various languages: Spanish, Dutch, Chinese, Lithuanian, Polish, French, Swedish, German, Estonian, Czech.