"The Picture of Dorian Grey". Oscar Wilde.

Part gothic novel, part comedy of manners, part treatise on the relationship between art and morality, The Picture of Dorian Gray continues to present its readers with a puzzle to sort out.
The essential plot of the novel is a devastating story of an elegant young man corrupted by decadence and sin. He remains eternally young and beautiful, but his portrait reveals his true and hideous nature.

In my opinion there are three main heroes Lord Henry Wotton, Basil Hallward  and, surely, Dorian Grey.
At the opening of the novel, Dorian Gray exists as something of an ideal: he is the archetype of male youth and beauty. As such, he captures the imagination of Basil Hallward and Lord Henry Wotton Dorian into an unremitting pleasure-seeker. Dorian is exceptionally vain and becomes convinced. The thought of waking one day without these attributes sends Dorian into a tailspin: he curses his fate and pledges his soul if only he could live without bearing the physical burdens of aging and sinning. He wishes that the portrait could age in his stead. As Dorian’s sins grow worse over the years, his likeness in Basil’s portrait grows more hideous. Dorian seems to lack a conscience, but the desire to repent that he eventually feels illustrates that he is indeed human. Despite the beautiful things with which he surrounds himself, he is unable to distract himself from the dissipation of his soul. His murder of Basil marks the beginning of his end: he cannot shake the thought that he has killed his friend.
Lord Henry is a man possessed of “wrong, fascinating, poisonous, delightful theories.” He is a charming talker, a famous wit, and a brilliant intellect. Given the seductive way in which he leads conversation, it is little wonder that Dorian falls under his spell so completely. Lord Henry’s theories are radical; they aim to shock and purposefully attempt to topple established, untested, or conventional notions of truth. In the end, however, they prove naive, and Lord Henry himself fails to realize the implications of most of what he says. Lord Henry is a relatively static character—he does not undergo a significant change in the course of the narrative. He is as coolly composed, unshakable, and possessed of the same dry wit in the final pages of the novel as he is upon his introduction.
Basil Hallward is a talented, though somewhat conventionally minded, painter. His love for Dorian Gray changes the way he sees art; indeed, it defines a new school of expression for him. Once he has painted Dorian as he truly is, however, he fears that he has put too much of himself into the work. He worries that his love, which he himself describes as “idolatry,” is too apparent, and that it betrays too much of himself. Though he later changes his mind to believe that art is always more abstract than one thinks and that the painting thus betrays nothing except form and color, his emotional investment in Dorian remains constant. He seeks to protect Dorian, voicing his objection to Lord Henry’s injurious influence over Dorian even after their relationship has clearly dissolved. Basil’s commitment to Dorian, which ultimately proves fatal, reveals the genuineness of his love for his favorite subject and his concern for the safety and salvation of Dorian’s soul.

I think the main theme of the novel is The main theme of The Picture of Dorian Gray is the relationship between beauty and morality. Oscar Wilde plays on the Renaissance idea of the correspondence between the physical and spiritual realms: beautiful people are moral people; ugly people are immoral people. His twist on this theme is in his use of the magical contrivance of the portrait.

To sum up, I should say, that the novel is not for everyone mind. I like books with something mystery. However, others claim that the novel is immoral.