Paul Gregory (William Sylvester) is an accomplished composer despite his blindness & his beautiful wife Anne (Barbara Shelley) seems to be the perfect supporting wife. But unknown to Paul she is having a passionate affair with Ricky (Alexander Davion) a struggling artist. Keen to support her artist lover & give them more time to make love she persuades Paul to commission Ricky to paint her portrait. But Paul senses their affection for each other & threatens to cut Anne off without a penny. Desperate to keep both her lover & Paul's money Anne plots the perfect murder & asks Ricky to carry it out.