Mariko Koike is a popular detective and horror novelist.

Koike was born in Tokyo and graduated from Seikei University.

Her first collection of essays was Recommendations to Women of the World and it became a bestseller.

Several of her novels have been translated in to English by Deborah Boliver Boehm.

She lived with her husband writer Yoshinaga Fujita until his death on 30 January 2020.