In a corner of Ben's bedroom lies a cherished pop up book which is home to the Abadas, Hari the hippo, Ela the fox and Seren the bat, the most curious, adventurous and funniest pop up animals that any book could possibly have. Hari the hippo is teaching the other Abadas to swim! Hari wants to show Seren and Ela the wonders of the sea bed with the help of the word of the day.