Now in paperback, Ottoline and Mr Munroe go on a secret city safari in the fourth book of the award-winning series, from 2015-2017 UK Children's Laureate, Chris Riddell. Ottoline and Mr Munroe love puzzles, clues and mysteries. One day, they meet an enigmatic purple fox, who offers to take them on a night-time urban safari. The fox shows them all the hidden animals of the city and Ottoline makes notes on them in her field notebook. Mr Munroe is making notes too - on the anonymous poems he finds stuck to lampposts on their journey. Who is this secretive poet, and how can he and Ottoline help them mend their broken heart?