The book features two suspenseful novels, the main character of which is private detective Igor Gladychev. In the first one — "Robbery in Spanish" — during his vacation in the Spanish town of Susanna Cruz, he meets several Russian tourists and together they go on an excursion to the famous Adelite cave. As soon as they descend into the underground, there is a monstrous explosion. The guide dies, and the cave partially collapses. Cut off from the world, the tourists try to find another way out and stumble upon an ancient skeleton in one of the grottos. A bony hand clutches a scroll, which describes in detail the location of Christopher Columbus' treasure… In the second one — "The Mystery of the Sacrificial Lambs" — Igor goes on vacation this time to Turkey. There, members of the tourist group, which includes the private detective, perish one after another. It is clear that a serial killer is at work. But who is he and why is he killing people who are not even acquainted with each other? Or are they still acquainted?..
