The story takes place in 1910 on the river Volha in the cottage near city Samara (in soviet period Kuybyshev). It is tale about friendship of the 10 yo Dinka (Nadezhda), daughter of wealthy professional revolutioner, who lives with her mother and family in the cottage above Volga river, and Lyonya (Leonid), beggar living on Volga boats.
In 1910, there were Zhiguli rapids on the Volga river (cf painting Repin: Burlaki na Volge - http://en.wikipedia.org/wiki/File:Ilia_ ... 873%29.jpg ). While film Naydi menya, Lyonya! shows river with rapids, this film shows Kuybishev reservoir created now above corresponding dam. The are rocks connected with legend about Stenka Razin with cave, where lives Lyonya after his escape from the boat and its owner.
While film Naydi menya, Lyonya! ends, when Lyonya escapes away from tsar police, and Dinka only appeal to him "Find me later, Lyonja" (Naydi menya, Lyonya!), the presented serial ends by happyend, when Dinka's family escapes to Kiev and adopts Lyonya as his son.
Three series: Dinka, Lyonya, Father.
I can present those three sources (a little better resolution):