Jack Frost's sick wife has tragically passed away, her sister Marion pays him a visit and tells him that she can stay, as long as he likes to help him sort out her sisters affairs.
D. C. Barnard must have struck lucky or asked for a transfer as he's no longer at the Denton Nick, new coppers have arrived one of whom is a D. S. Gilmore.
He is an old fashioned copper who's style and demeanour, appears an almost mirror image of Frost, making them ideally sorted to work as a team.
D. I. Jack Frost though reasonably highly ranked is not the most senior officer at Denton Nick, this honour goes D. C. I. Allen but he has been stricken down with the lurgy, and consequently not available for duty.
Superintendent Mullett lumbers D. I. Frost with the burden of being in total charge at Denton Nick, which means having to single handedly deal with the principle detective on the cases at hand.
The cases he has to cope with include a missing school girl, who doesn't manage to complete her paper round, and a snooty couple Alex and George Compton who claim they are being persecuted in their house.