the book offered to the attention of readers examines unknown pages of the work of S. L. Frank (1877-1950) related to his participation in Eurasian projects and relations with Eurasians, especially with his friend L. P. Karsavin (1882-1952). It should be noted right away that Frank himself never considered himself a Eurasian, but was just a "fellow traveler" of this movement. The history of Frank's ties with the Eurasians - short-lived and fragile - we recreate, relying primarily on the epistolary heritage of the philosopher and his interlocutors.