There is sometimes a macabre pleasure in planning a murder, in going into every detail as to how the victim can be killed beyond any possible doubt. It can even be rather amusing to try to prove - theoretically at least - that such a violent deed can be perpetrated without the criminal being found out.
The group of art students gathered in Agatha Troy's studio spent just such a morning discussing how a model could be killed by the simple expedient of placing her in a certain pose in which she would certainly be stabbed, quickly, and one might almost say unobtrusively. The rub that detracts from such ghoulish enjoyment is of course the fact that unless you are prepared to run grave risks, the foolproof murder remains simply an idea. In this case, however, it gave someone the very idea that was wanted, for this person decided that it would be the best way of eliminating little Sonia Gluck - the model herself - who, although exceedingly good to behold, was vastly provoking to live with. Whoever planned the murder would, with a little judicious manipulation, not actively have to carry it out. The `props' and an unfortunate third party would do the rest.
Such is the situation that in fact develops; such is the problem, at once neat and complex, that confronts Inspector Alleyn. The mystery is further complicated by the students themselves, who exploit this dramatic situation to indulge in histrionics that are as baffling as they are amusing.