A strange guest at a notary's office in the mountains lost his wife in an avalanche. But some mystical signs give reason to assume its existence. The author involves the reader in a detective investigation, and at the same time immerses him in the mysterious history of ancient languages and civilizations, which the main character is engaged in, trying to find a single proto-language of humanity. This educational, action-packed book contains many other unexpected mysteries and their solutions, as well as adventurous adventures and love, which is so necessary in the search for truth.