An old friend of Hetty's - her partner in a music-hall routine years ago -- seeks her help in locating her troubled foster daughter, Chrissie. A teenage mother, Chrissie has disappeared just as a series of arson attacks on local homes have occurred --and Chrissie has a history of setting fires! As Hetty and Geoffrey look for Chrissie, a local newspaper photo competition reveals more than the photographer intended, prompting Geoff to dress in drag -- blonde wig, high heels and all -- to confront the arsonist. Hetty picks up a much-needed reward for her work in this case, and at the presentation of the check, proves that the new gumshoe hasn't lost her knack for the ol' soft-shoe!