 A former singer lives alone with her fortune, and Fernando, her nephew, a low character whom she refuses to lend more money. Elisa leaves prison and starts a new life as personal attendant to the ageing singer, using her knowledge of former nurse - a profession she can not return to. Fernando meets Elisa, and together they plan to poison the lonely woman, and use her money abroad. Alibis are well planned, but it s written that those who kill by the sword, will perish by the sword.