To attract customers to his hotel, Mr. Bordemer decides to make an advertising video. But the filming turns into a disaster when Rosy unexpectedly shows up on the set.
As usual, the Seaside Hotel is empty. Rosy has another idea to get customers and it works: thanks to an improvised ukulele number, three new, rather strange customers arrive.
Once again, the Seaside Hotel is on the brink of collapse. Rosy and George-Albert have a way out. The Majestop, one of their competitors, is offering its customers a free hot air balloon ride. The Seaside Hotel then decides to outbid them by offering an elephant ride.
There is a lot of commotion at the Seaside Hotel, which is hosting former movie star Dolly. But the Majestop doesn't see it that way and Olga is ready to do anything to get the star to change residence.
It's Mrs. Simone's birthday, the cook. George-Albert and Rosy are thinking about an original gift idea when a strange couple shows up at the reception. Immediately, their imaginations start to boil.
After a bad fall, Madame Simone, the cook, has to be taken to the hospital. That's the day that two food critics choose to come and test the cuisine of the Seaside Hotel.
Mr. Bordemer has pulled off a masterstroke: thanks to the private beach he has set up opposite his hotel, customers are flocking in. Suddenly, a swimmer emerges from the water yelling at the shark.
Rosy would like to have some pocket money to do some shopping. So she offers to look after the hotel guests' children with activities on the beach on the programme.
George-Albert is overexcited because he has just won a trip to Kenya. As for Rosy, she doesn't want to be separated from her best friend.
While trying to help their enemy, Olga, George-Albert and Rosy end up stranded on a desert island. The boats are in a thousand pieces and night is approaching.
George-Albert, who dreams of having a pet, asks his father for permission. But Mr. Bordemer is inflexible: no animals will be accepted at the hotel.
Rosy is very happy to participate in the costume contest on the beach. But her face is covered in red spots due to a strawberry allergy. There is no way she is going to compete under these conditions.
George-Albert and Rosy are over the moon: they are going to take part in the competition for the most beautiful homemade kite. A hotel guest, a retired professor, gives Mr. Bordemer an idea.
George-Albert discovers with amazement that his father has placed an ad in the local newspaper. According to Rosy, even if part of it is missing, the message is clear: Mr. Bordemer is looking to get married.
George-Albert and Rosy are getting ready to leave with Péjo for a boat trip when a crowd of customers, evicted from the Majestop because of a short circuit, rush to the Bordemer hotel.
A group of scouts set up camp in the grounds of the Seaside Hotel. It's another opportunity for Rosy and George-Albert to have fun, even though George-Albert isn't keen on the idea of sleeping in a tent.
Rosy can't take it anymore: she doesn't understand why everyone treats her like a baby. To add to her incomprehension, she is refused access to a ride at a funfair.
Things have been going badly between George-Albert and Rosy since they argued over tickets for the magician Magic M's show. Rosy accepts her worst enemy's invitation to the Majestop Hotel.
For once, the Seaside Hotel is packed. And for good reason, it is hosting a twins conference. But strange things are happening within the establishment and guests are complaining.
George-Albert and Rosy discover a baby seal on the beach. Rosy absolutely wants to take it back to the hotel and adopt it but George-Albert categorically refuses.
In order to attract customers, the Seaside Hotel implemented an idea of Rosy's: to organize a beach volleyball tournament. But this initiative is not a success.
George-Albert is tired of seeing his father spend his time in his accounts books and thinking only about the hotel. This time, it's decided, he's going to summer camp.
The hotel is awaiting the arrival of a Russian delegation. Mr. Bordemer has gone into town to find a suitable decoration when Rosy notices a strange note on the hotel register.
Mr. Bordemer has a knife to his throat and sees only one solution: sell the hotel. Since he lacks the courage to tell them, he sends away all the staff, including Rosy and George-Albert.
George-Albert is excited to participate in the Raspberry Festival as a reporter. Unfortunately, the unexpected arrival of Rosy's parents forces him to stay at the hotel.
While playing in the lighthouse, George-Albert and Rosy discover objects dating from the 18th century, including a parchment supposed to belong to one of George-Albert's ancestors.