Doctor Miguel Azzini is found shot dead dead. The police suspect his colleagues: Elena Carli, his former mistress and owner of the clinic where he worked; Roberto Carli, her surgeon husband; Doctor Paula Lombardo, Roberto's mistress; and the clinic's administrator. Inspector Nardi discovers that Elena has a heart condition and had offered Miguel an increased sharehold in the clinic in order to dissuade him from leaving for another post. Elena's heart condition is worsened by the relentless police scrutiny and by her suspicion that Roberto is the murderer. She has to be rushed into hospital and is even more alarmed when Roberto prepares to operate...

Après avoir surmonté une crise intérieur, Paolo, jeune chirurgien, reprend son travail dans la clinique dont la principale actionnaire est Elena, sa femme. Un jour son confrère Giulio est assassiné...

El doctor Miguel Azzini, prestigioso cirujano, es asesinado cuando negociaba un contrato con otra clínica. De su despacho desaparecen los contratos y es borrada una llamada del contestador, las sospechas recaen en los directivos de la clínica que no desean su marcha con la consecuente pérdida de prestigio. El inspector encuentra indicios y móviles en todos los sospechosos, descubrir al criminal no será tarea sencilla.