Ying and Yan (Инь и Ян) is a play by Boris Akunin written for the director Alexey Borodin, edited by Zaharov in 2006.
As Boris Akunin writes in the editorial by which the book begins, these versions have the same plot, but belong to two different worlds.
When Slyunkov is asked to read the will again, it is revealed that all Sigizmund's money goes to Inga, Yan gets a Chinese paper fan, and the rest gets nothing.
That's where Fandrin enters the room and tells the family he had an accident because of rough roads and a not so solid cart.
Fandorin plans on questioning every present person, asks Dickson to autopsy the body and check the cognac for poison, then tells everybody except Yan to leave.
After some hesitations, Yan supposes his aunt Lidiya would be the thief, as she wants youth and wealth desperately.
Meanwhile, Arkasha tries to impress Glasha with his guitar playing and singing, but Masa arrives and steals the spotlight, much to the lackey's chagrin.
Glasha leaves and Faddey sits on the bench and laments about his destiny as a manservant and his total lack of future plans.
Fandorin takes a look at the paper Yan signed earlier and finds out it is a contract of disposal for the fan.
He also inspects the walls and finds that the bullet Yan said he dodged was indeed fired by him in order to kill a panicking crime partner.
Realizing he's trapped, Yan grabs Inga and points a syringe full of tetanus bacteria towards her.
When Slyunkov is asked to read the will again, it is revealed that all Sigizmund's money goes to Inga, Yan gets a Chinese paper fan, and the rest gets nothing.
Fandorin plans on questioning every present person, asks Dickson to autopsy the body and check the cognac for poison, then tells everybody except Yan to leave.
After some hesitations, Yan supposes his aunt Lidiya would be the thief, as she wants youth and wealth desperately.
Meanwhile, Arkasha tries to impress Glasha with his guitar playing and singing, but Masa arrives and steals the spotlight, much to the lackey's chagrin.
Fandorin then questions Inga, and she tells him about having fallen in love with Yan (who didn't change that much since he was a kid, but whom she admires for being a genius) and about Kazimir's disastrous situation in life.
Glasha leaves and Faddey sits on the bench and laments about his destiny as a manservant and his total lack of future plans.
The doctor is stunned as he doesn't seem to find an explanation for Kazimir's death, his autopsy having revealed nothing abnormal.
The doctor starts telling a story about his having debts he couldn't return and when he mentions someone who paid everything for him, he's shot by someone from outside.
Fandorin then declares that no-one may leave the house, to what Yan opposes, saying he's rather spend all this time at his laboratory, which is in the garden as well.
In the private museum, Fandorin, Masa and Faddey discover the thief as he pulls the Dao Helmet on his head: it is Slyunkov.
Fandorin takes a look at the paper Yan signed earlier and finds out it is a contract of disposal for the fan.
Alone with Faddey Slyunkov tries slapping himself with the white side of the fan and is surprised to see it work: as he pulls the helmet off, his hair turns black, he became younger and healthier.
Outside (the text says "in front of the curtains", but it obvious these actions take place outside, between the house, the museum and the lab), Masa rolls the wheelchair with Fandorin on it.
Masa breaks in only to discover a dead Arkasha, an astonished Yan with a pistol in his hand and Inga with blood all over her forehead.
Yan is shocked, nevertheless he doesn't resist when Masa and Faddey lock him into a closet (he manages to take with him a living rabbit and another full syringe).
Masa and Faddey leave with Arkasha's body and only then Fandorin tell Inga it was her all along, and he only faked suspicion of Yan in order to her to reveal more evidence.
That's when Inga reveals she now possesses the fan and slaps Fandorin with its black side, incapacitating him, but keeping him alive.
That's when Faddey explains he repaired it after taking it from Slyunkov, but when he glued the paper back, he turned it the wrong way.
Yan sits Inga on Fandorin's wheelchair and says she got infected with tetanus and will certainly remain paralyzed for life.