Miss Daley has given up working as a solicitor's secretary because her old boss is leaving. When she finds out that he is still with the firm she becomes very ill. She goes to see Jo Hardy about her collapse and tells Jo that she is convinced she has heart trouble. Unfortunately, Miss Daley trails trouble after her, and Jo soon finds that there is very much more to this case than meets the eye. Guest stars Rachel Kempson, Colin Douglas, Kenneth Farrington, Zohra Sehgal and Edward Kelsey.