Mum and Dad have left - gone to Mars, and they're never coming back . . .
FREEDOM AT LAST!
But this isn't one of Dad's weird jokes; it's REAL. It's up to ten-year-old Eliza and her genius little brother, Johnnie, to find out what's going on, and launch a rescue . . .
Can they handle vampire squids, a suspicious villain, a secret island full of traps and a trip into space? And - more importantly - will they ever get their parents back?