Sister Ships and Alastair (Ant and Cleo Book 2)
Dominic Green, author
Somewhere in Bedfordshire, someone may be working on a bomb that could destroy a world. Mysterious Men in Black need Ant and Cleo to find out for sure, but they'll have to get past Flossie and the girls first...
Dominic Green books are frickin' fun! Read and enjoy. Don't think about whether anything is technically possible. In this universe physics is just a tool, not a law. Just lay back and have a good time, because you just can't help it here.