DI Jack Frost investigates the stabbing of a woman during a robbery at a sub-post office. He is convinced that they have the culprits in custody but is frustrated by the limits placed on his ability to gather evidence. He also looks into an attack on the very pretty Helen Tudor who was pushed down the stairs at her university. She has no idea who may have pushed her but had recently rebuffed a professor, Dr. Michaelson, who had a reputation for getting too "close" to his students. In the course of the investigation, Frost learns that a woman very similar in appearance to Helen drowned some two years previously, even though she was a very good swimmer. Clive Barnard, now a DS in Boxborough, assists Frost in locating a possible suspect, a student who knew both girls. Frost finally finds himself a flat but also gets some unexpected lodgers.
DI Jack Frost investigates a series of commercial robberies. He's assisted by DC Carl Tanner, a black officer recruited by Supt. Mullett to encourage racial balance on the local force. When Frost makes an arrests on the local housing estate, Mullett's only concern is the culprit's racial background as he's concerned that the area not become a racial powder keg. When Frost's informant on the estate is killed, the case becomes a murder investigation, but all of the suspects are black and racial tensions are on the rise. In the course of his investigation, Frost determines that his informant had a number of secrets.
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