Rose and Robert are like any other set of twins with one small difference; they live in an apartment that doesn't officially exist. Through a secret door in the building elevator is a small space that they call home. But their existence risks becoming exposed when an older girl accidentally discovers their secret place! With strange neighbors and other strange happenings, will the twins be able to protect their home?

— Simon Traub-Epstein, International Library of Young Authors

From the publisher: “Ten-year-old twins Rose and Robert live in Room 7, a secret room in the back of their apartment building’s elevator. Nobody except their family has ever seen the secret door that leads to their room. That’s why they never expected their neighbors to invade their apartment. But what will happen when the apartment is finally revealed? And how will Rose and Robert get everything back to normal in Room 7?”