Miss Silver series (15 books) by Patricia Wentworth

Contents:
Miss Silver 06 - Miss Silver Deals With Death Aka Miss Silver Intervenes
Miss Silver 07 - The Clock Strikes Twelve
Miss Silver 09 - She Came Back Aka The Traveller Returns
Miss Silver 10 - Dark Threat aka Pilgrim's Rest
Miss Silver 12 - Spotlight Aka Wicked Uncle
Miss Silver 14 - Eternity Ring
Miss Silver 18 - The Ivory Dagger
Miss Silver 20 - Anna, Where Are You Aka Death at Miss Silver
Miss Silver 24 - The Silent Pool
Miss Silver 25 - The Vanishing Point
Miss Silver 26 - The Benevent Treasure
Miss Silver 27 - The Gazebo Aka The Summerhouse
Miss Silver 28 - The Listening Eye
Miss Silver 29 - Poison in the Pen
Miss Silver 32 - The Girl in the Cellar