For the first time in their lives, Holly, Tracy and Belinda went on vacation not just anywhere, but to Paris and were ready to temporarily curtail the activities of their Detective Club for the sake of such an occasion, but that was not the case. And the reason for this is strange strangers who appeared on the train in the uniform of security guards, took the inconspicuous passenger somewhere, and then literally began to follow on the heels of the inseparable trinity. It looks like the girls are in the way of criminals, but what exactly are these two up to, how can they be exposed, and who are they in the end? “Who are we getting in the way of?!” - the girls ask themselves. And to find out, you need to climb the tower of the famous cathedral...