Larklight — Philip Reeve

It was just another normal morning in space when disaster struck. My sister Myrtle (who is quite irritating, as girls generally are) and I faced the most awful peril, and we hadn't even had breakfast.

A Mr. Webster was coming to visit. Visitors to our house were rare and so a frenzy of preparation ensued, but it was entirely the wrong sort of preparation, as we discovered when we opened the door. This is the story of what happened next, and our Dreadful and Terrifying adventure to save each other and the known Universe.