49 books • 10 series
Hardcastle's Quartet (A Hardcastle and Marriott Historical Mystery, #12) (A Hardcastle mystery)
Hardcastle's Quartet: A Police Procedural Set at the End of World War One (A Hardcastle and Marriott Historical Mystery, #12)
Hardcastle's Frustration (A Hardcastle and Marriott Historical Mystery, #10) (A Hardcastle mystery)