Dirk Bogarde plays Simon Sparrow for the final time in this, his last in the Doctor series. Sir Lancelot is usually shouting and yelling his way round the hospital, so it surprises everyone greatly when he suddenly becomes quiet, polite and considerate. What on earth can be the matter? Has he caught a disease? Doctor Sparrow decides to investigate and finds Lancelot to be suffering from an incurable condition - he is in love! Turning to Sparrow for advice, Lancelot attempts to woo his beloved; meanwhile Sparrow’s love life is, as always, far from quiet!