The Goldengrove series by Jill Paton Walsh consists of 2 books, published between 1972 and 1976. The series begins with Goldengrove.
The Gripping Tales series by Jill Paton Walsh consists of 2 books, published between 1989 and 1995. The series begins with Birdy and the Ghosties.
The Imogen Quy series by Jill Paton Walsh consists of 4 books, published between 1993 and 2007. The series begins with The Wyndham Case.
The Lord Peter Wimsey & Harriet Vane series by Jill Paton Walsh consists of 4 books, published between 1998 and 2013. The series begins with Thrones, Dominations.