Used book – Coups de théâtre, Christian Grenier

When the curtain rises on the actress lying on the floor, a dagger in her back, the audience believes the murder is part of the staging. But Matilda has indeed been murdered... Inspector Germain and his young intern Logicielle will embark on an investigation full of theatrical twists and turns, with all the play's protagonists, from the author to the stagehands, as suspects.