Arttu Tuominen (b. 1981) is a Finnish environmental inspector moonlighting as a crime writer. Tuominen was awarded the ‘Johtolanka’ Prize for The Oath, garnering praise for the novel’s cleverly constructed flashbacks and realistic dialogue, making him eligible for the Glass Key Prize. Tuominen’s writing is distinctive for giving a compassionate and relatable voice to those on both sides of the law. He lives in the south-western Finnish town of Pori with his family.