Robin Stevens’ “Murder Most Unladylike” bestselling series of children’s mystery books are being adapted for TV by StudioCanal . Created by Stevens and written for television by Anna McCleery (“Free Rein,” “The Lady Grace Mysteries”), the returning six-part series has James Strong (“Broadchurch,” “Mr Bates vs. The Post Office”) attached as lead director. Described as blending “Enola Holmes” with Agatha Christie, “Murder Most Unladylike” is a twisty murder mystery series set in the 1930s