In this sixth book about the popular Ingrid and Ivar they pack their swimming things and go to the water park where there are lots of new and exciting things to do. First they have to pay to go in and then they have to change and shower. There are lots of different pools, fun water toys and exciting water slides and they can pretend that they’re in the sea. But are there fish on the bottom? And are they brave enough to put their heads under water? Of course they are, Ingrid and Ivar are like dolphins and seals in the water! And when they have finished swimming they have to try out the sauna of course. Time flies when you’re having fun, and Ingrid and Ivar can’t wait to go back again!