There is nothing to say, the holidays are beginning “quietly and peacefully” for inseparable friends Holly, Tracy and Belinda! No sooner had the girls arrived in the mountainous region than they witnessed a real plane crash. Moreover, it turns out that this plane was flown by a criminal who took with him a whole bunch of money! And most importantly, he disappeared without a trace, just like he fell through the ground! “It seems that the local mountains are sending us a new secret!” - the members of the Detective Club think with bated breath and decide to find traces of the kidnapping pilot at all costs. And when luck seems to fall into their hands...