Tilly and Sally plan for their party. Two midshipmen arrive on bicycles. Tilly and Sally knock down their guests and are banished from the party to a music lesson. They lock the nurse in a wardrobe and the midshipmen climb in through a window. They then raid the kitchen and wreck the party by bursting in on roller skates. The four then make their escape on bicycles, the girls riding on the handlebars. The partygoers give chase on foot. Eventually the girls are dropped at their music teacher's house for the lesson. When the chasing party burst in they are summarily dismissed by the teacher.