Zippy, George and Geoffrey can hear Bungle making noise upstairs, but Bungle won't tell them what's going on. However he tells Zippy and George that he's tidying up their bedroom as a surprise for Geoffrey, but Zippy accidentally lets it slip, so Geoffrey pretends he doesn't know a thing. Geoffrey decides that he, Zippy and Bungle should make a surprise for Bungle, but George has to make sure Zippy doesn't let their secret slip. Bungle shows Geoffrey the new room and he's very impressed, but then Bungle finds out he knew already what was happening. Bungle loves the mobiles Geoffrey, Zippy and George made for the room. Geoffrey reads a story called 'A Big Surprise For Bertie'. Then Zippy gets a surprise as Geoffrey and George made him a model house and he loves it.