Enid Blyton <br/><br/>
The O'Sullivan Twins 

<br/><br/> Spoiled Alison, Pat and Isabel O'Sullivan's cousin, is finding life at St Clare's difficult. But at least she's not as lonely as unpopular Margery. 
<br/><br/><label>ISBN: </label>9780603559594 
<br/><br/><label>Dewey Class. No.: </label>English BLY