There are 3 books in the The Laidlaw Investigation series. The newest book is Strange Loyalties which came out in 1992.

1
Laidlaw

Book cover of Laidlaw
First in “a crime trilogy so searing it will burn forever into your memory. McIlvanney is the original Scottish criminal mastermind” (Christopher Brookmyre, international bestselling author).
 
The Laidlaw novels, a groundbreaking trilogy that changed the face of Scottish fiction, are credited with being the founding books of the Tartan Noir…
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2
The Papers of Tony Veitch

The Papers of Tony Veitch

THE SECOND IN THE ORIGINAL LAIDLAW TRILOGY. WINNER OF THE CWA SILVER DAGGER.
THE DARK REMAINS, Laidlaw's first case, out 2 September 2021. PRE-ORDER NOW!

'In a class of his own' Guardian
'Reads like a breathless scalpel through the bloody heart of a great city' Denise Mina

Eck Adamson, an…

3
Strange Loyalties

Strange Loyalties

THE THIRD IN THE ORIGINAL LAIDLAW TRILOGY
THE DARK REMAINS, Laidlaw's first case, out 2 September 2021. PRE-ORDER NOW!

'The Laidlaw books are not just great crime novels, they are important ones' Mark Billingham
'It's doubtful I would be a crime writer without the influence of McIlvanney's Laidlaw' Ian Rankin…