The series "The Heart Will Not Deceive, the Heart Will Not Betray" is a Russian detective story about the investigation of a strange suicide that the deceased inexplicably tried to disguise as a murder. The renowned psychiatrist Mikhail Kozirev decided to end his life. But who could have hurt the experienced doctor so much that he dared to sacrifice his life to frame him? Private detective Alexey Kisanov takes on the investigation. However, the case unexpectedly becomes complicated by a series of mysterious attacks.