As a young child, Frederic had been apprenticed to a pirate by mistake when he should have been apprenticed to a pilot. Now, having reached his 21st year, Frederic's indentures are at last over and he happily leaves the service of the pirates. When Frederic meets the beautiful Mabel, one of the many daughters (or wards in Chancery) of Major-General Stanley, they fall in love and decide to marry. However, complications arise when the pirates decide to marry the rest of the Major-General's daughters, themselves - and Frederic's birthdate turns out to be not all it seems.

The Baronets of Ruddigore have been cursed by a witch. Each Baronet, in his turn, must commit a crime a day - or die in torture. To escape his dreadful fate, the latest Baronet, Sir Ruthven Murgatroyd, disguises himself as Robin Oakapple, a farmer. Only two people know his true identity - his faithful servant, Old Adam Goodheart, and his adopted brother, Richard Dauntless, a seaman. Robin Oakapple is in love with the beautiful Rose Maybud and wants to marry her - but his future plans appear doomed when his true identity is revealed.