Sergey Chernetsov is the head of a department at a completely extraordinary institute. The rarest combination of genes allowed his employees to be in one of two forms - human or animal. Of course, there were no elephants or crocodiles among the colleagues. He himself shared his existence with a great white shark. A series of bloody events unfolding in the Neva and its environs indicated that the protective ring of the Earth had been broken and Ancient Forces were rushing into our world. Their victory will leave no room for humanity. Unsuccessful attempts to fight the aliens lead Chernetsov and his employees to an incredibly risky and, perhaps, the only correct conclusion - it is necessary to strike at the very heart of the threat, lurking in the citadel of the Crimson World...