Marga is not a normal cat. She lives on top of the tower bell at the cathedral of Barcelona and she is always ready to help her friends. She takes her laptop everywhere in the city either to help or to take part in any celebration. But the naughty gargoyles, the Elephant and the Unicorn, make things difficult for her. This time they have hidden Gori the snail somewhere in the Gothic ward. Marga the cat must find him before the day ends because it's the snail's birthday and there is a very special party waiting for him. Luckily the cat has the precious help of Barcino the mosquito and the artist Santiago Rusiñol.