It was a picture book story about Monsieur (something...it was set in France) who had a pear tree with the most delicious pears on it, and a weird and wonderful monster used to come and eat the pears so he stayed up to see if he could catch it and then befriended it. In the end it turned out it was 2 children dressed up in a blanket. Sounds rubbish was it was in fact great. Now what was it called?