El secreto del unicornio (Emma Spark, 3)

It's been a while since she met Rusty, the veterinarian, and Emma has become quite the expert, always with the help of her dear friend Arno. But magical creatures never cease to amaze them. Suddenly, they find themselves caught up in a strange flight that takes them deep into the Amazon rainforest. There, a new enemy is tracking their every move. Only the unicorn's secret can save them…