Much-loved Calleshire research chemist Derek Tridgell has been ill for some time.
On his deathbed, his incessant, but unintelligible mutterings culminate in a very clear cry of foul murder.
Sloan and Crosby are brought in to investigate whether these are just the ramblings of a man at death's door, or a real confession at the final hour.
Allison & Busby Learning curve | catherine aird
