First broadcast 9th/16th/22nd January 1992.
The discovery of two skulls at the site for a new by-pass road leads the team to a pharmaceutical company.
Mark McManus - DCI Jim Taggart
James MacPherson - DS Mike Jardine
Ann Mitchell - Annie Gilmour
Ken Drury - Dr. Nielson
Lorna Heilbron - Morag Nielson
Michael Cochrane - Derek Amlot
Leone Connery - Christine Gray
Jeremy Young - Prof. Hutton
Blythe Duff - DC Jackie Reid
Iain Anders - Supt. Jack McVitie
Robert Robertson - Dr. Stephen Andrews
Harriet Buchan - Jean Taggart
Juliet Cadzow - Maureen MacDonald
Geoffrey Beevers - Angus Mackay
Dougray Scott - Colin Murphy
Calum Shaw - Dennis Taylor
Alison Sterling - Jill Cramer
Grant Cathro - Carl Young
Niven Boyd - Frank Sullivan
Diane Taylor Whitehead - Janet Gilmour
Simone Lahbib - Caroline Peterson
David Gallacher - Reporter
Bill Denniston - Address to the Haggis
Jim Boyce - Truck Driver
Bill Little - Prisoner
Shareen Nanjiani - Newsreader
Iain Wotherspoon - Doctor
Betty Bright - Cleaning Lady
Jacqui Prentice - Hotel Receptionist
Emma Currie - Madeline Brown
Gary Grochla - Locksmith
Michelle Gomez - Hairdresser
Louise Dobbie - Maureen's Daughter
Paula Fraser - Maureen's Daughter
