First broadcast 7th May 2009.

During a reconstruction of a knife crime for trainee police officers, one lecturer, Michael Shearer, accidentally kills another, Alistair Matheson.

Blythe Duff ... DS Jackie Reid
John Michie ... DI Robbie Ross
Alex Norton ... DCI Matt Burke
Colin McCredie ... DC Stuart Fraser
Katrina Bryan ... Ellis Sinclair
Andrew Byatt ... Shearer
William Armstrong ... Parkes
Martin Haddow ... Goldie
Margo Gunn ... Pippa
John P. Arnold ... Matheson (as John P Arnold)
Colin Harris ... Eugene
Francesca Dymond ... Doctor