Cari Meister 
Roller-coaster Ride [PDF ebook] 

The Three Horses are off on another zany adventure! Snowy, Princess, and Seb make plans to head to the amusement park. Snowy believes he will get great material for his book, Seb can ride the upside-down roller coaster, and Princess? Well, she heard there’s a posh cat spa near the park. The plan is set. But can the three friends escape the barn? And how are they going to get into the Amusement park?