The move to Chertsey sees the series return to its traditional format of a new case each week for Marker. In "Fit of Conscience" he is asked to investigate the collapse of a residential apartment block and it becomes apparent that the concrete has been incorrectly formulated. Those responsible for this, the primary cause of the collapse, leave the country and avoid being brought to British justice for their actions. The series often produced such downbeat endings, with the villains getting away with their crimes or at the very least, with the resolution unclear and further thought required on the part of the viewer.