Everyone is puzzled when Zara and Laurence's sandcastle disappears off the beach at night. Zigby decides to unravel the mystery, and everyone is surprised to find it's been the sea all along.

In his third jungle junket, Zigby Dives In by Brian Paterson, the upbeat zebra and his pals Bertie and McMeer tire of playing basketball and happen upon a hidden lagoon perfect for a day of fishing.

Zigby finds a treasure map and decides to follow it - not realising it's one that Zara and Laurence have made up as part of a game.