Grace Pearson is found dead at a local festival. Detective Inspector Sam Gillespie - to the bewilderment of newly arrived Detective Sergeant Felix Livingstone - uses Sister Boniface as his scientific adviser. She determines that Pearson died by suffocation after her head was pushed into sawdust. The investigation leads to the three Bellamy siblings, at whose home Pearson was a housemaid. Crime drama, starring Lorna Watson and Max Brown, with Belinda Lang and Robert Daws