Frode and Ib sleep under Ida's bed and play with Ida the next day. Cecilie and Hubert plan to trick Petra, and follow her down to the basement where Petra has a secret room. When the two are locked in, they find an exit and at the same time another entrance to Frode, Ib & Hubert's old part of the basement. The two children manage to steal the key from Petra and escape.