Mr Munroe is missing! From the award-winning Chris Riddell, Ottoline at Sea is the third enchanting Ottoline adventure.

Ottoline and Mr Munroe do everything and go everywhere together. That is, until the day Mr Munroe mysteriously disappears, leaving a strange clue written in string . . .

Armed with her Amateur Roving Collectors' travel pass, Ottoline sets off on a journey over, under and on top of the sea to find her hairy best friend - and bring him back home.