Matt Brown 
Compton Valance – The Time-travelling Sandwich Bites Back [EPUB ebook] 

How to get into the BIGGEST PICKLE ever.1. Create a TIME MACHINE SANDWICH.2. Accidentally let your evil older brother steal the sandwich and travel through time CHANGING ALL OF HISTORY.3. Set out to STEAL BACK the sandwich with the help of a secret agent FROM THE FUTURE.4. Save the world from TOTAL DESTRUCTION… (Probably.)