The girls are off to spend a day at the local wetland centre. Things begin to get interesting when Rachel finds strange prints in the mud. They look like dinosaur prints. Can dinosaurs really still be alive?

The girls find themselves on the track of something strange. Kelly is the only one who's not impressed when finally they discover the answer. This book is part of the very popular series Siti's Sisters, featuring Siti and her group of friends, who are so close they call themselves The Sisters.