Geroj - geolog Aleksandrov - so slomannym pozvonochnikom otpravlyaetsya v Tuvu na pereval, gde chasto bushuyut grozy, chtoby opredelit', chto prityagivaet molnii. On obnaruzhivaet poverhnostnye zalezhi svintsovyh rud.
Ivan Antonovich (real patronymic Antipovich) Yefremov (Russian: Иван Ефремов; April 22, 1908–October 5, 1972), last sometimes spelled Efremov, was a Soviet paleontologist, science fiction author and social thinker. He originated taphonomy, the study of fossilization patterns.