This episode takes on a tricky task in the technical constraints of 1963 TV - a story set in the world of super-rich financiers and socialites. It tries to convey an atmosphere of luxury, excitement, and tragedy but doesn't really succeed.
Of course the budget would make it difficult to portray hedonistic luxury but, given the quite extensive use (for the time) of location filming by series 4, one might expect this to be employed in a more creative way to give a better sense of atmosphere than we are offered.
Shots of airports and jets taking off are deployed to excite the 1963 audience's fantasies about life in the Onassis set but they mainly serve to pad out a thin plot and, as so often, things rest pretty much on Rupert Davies's indisputable innate appeal and Ewen Solon's ever-excellent portrayal of the witty and ebullient Lucas
Unfortunately, in an attempt to make up for the atmospheric deficiency, we are treated, in the case of one of the main characters, to a return of the gruesome am-dram attempts at histrionics of several earlier episodes though the lovely and rather more professional Moira Redmond does offer some compensation.