Meet Flo and Joseph Wanderday.
Their mum is one of the world's greatest explorers, but she's gone missing on her latest expedition. When a mysterious stranger appears, they discover the sinister reason for Mum's trip.
This was no ordinary expedition and Mum was trying to uncover crimes committed by Sir Frederick Titan, a much-loved TV presenter who claims to be a protector of the natural world.
Flo, Joseph and their friends Funmi and Isaac find a map and follow clues taking them to a secret island to save Mum and expose Titan's fishy plans...