The complete Slough House/Jackson Lamb book list in order of publication along with reviews –
Slough House 0.5 – Reconstruction
Slough House 1 – Slow Horses
Slough House 2 – Dead Lions
Slough House 2.5 – The List
Slough House 2.75 – Nobody Walks
Slough House 3 – Real Tigers
Slough House 4 – Spook Street
Slough House 5 – London Rules
Slough House 5.5 – The Drop (US title: The Marylebone Drop)
Slough House 6 – Joe Country
Slough House 6.25 – The Last Dead Letter
Slough House 6.5 – The Catch
Slough House 7 – Slough House – February 2021