It Must Be Love - S1.E5

Lorenzo's spoilt cousin Valentina arrives and Leonardo is smitten by her. She also falls for him but then transfers her affections to Tom,unaware that 'he' is Lisa in disguise as girls are not allowed to be art students. When Valentina discovers the truth she sets out to expose Lisa. Fortunately Leonardo's latest invention, a bicycle powered by explosives,is able to head her off before she can tell any tales.