Summary of the Osiris-Isis-Horus Myth
“In ancient Egyptian tradition, at least as preserved to us, the Osiris-Isis-Horus myth was never recounted as a coherent whole; rather, it served as a source of allusions for a large number of religious texts. It was a sequence of scenes that was unmistakably rooted in the mortuary cult. The only texts that furnish us with a continuous narrative are written in Greek, by Diodorus (1st century BC) and especially by Plutarch (c. 46 - 120 AD). But in their care about a single, meaningful, stimulating story these authors seem to have strayed from the Egyptian form of the myth. The myth has both a prehistory and a starting point. The prehistory is not narrated in the Egyptian texts, yet it is necessary for all that follows (see Jan Assman, Death and Salvation in Ancient Egypt, p. 23).”
“The basic Egyptian myth goes like this: Osiris became ruler of the land, but was tricked and slain by his jealous brother, Seth. According to the Greek version of the story, Typhon (Seth) had a beautiful coffin made to Osiris’ exact measurements, and with 72 conspirators at a banquet, promised it to the one who would fit it. Each guest tried it for size, and Osiris was the one to fit exactly. Immediately Seth and the conspirators nailed the lid shut, sealed the coffin in lead, and threw it into the Nile. The coffin was eventually borne across the sea to Byblos, where Isis, who had been continually searching for her husband, finally located it. She returns the body to Egypt where Seth discovers it, cuts the corpse into pieces, and scatters them throughout the country. Isis transforms herself into a kite, and with her sister Nephthys, searches for and finds all the pieces (except the male member, which she replicates), reconstitutes the body, and before embalming to give Osiris eternal life, she revivifies it, couples with it, and thus conceives Horus.”
“Of the parts of Osiris’s body the only one which Isis did not find was the male member, for the reason that this had been at once tossed into the river, and the lepidotus, the sea-bream, and the pike had fed upon it; and it is from these very fishes the Egyptians are most scrupulous in abstaining. But Isis made a replica of the member to take its place, and consecrated the phallus, in honour of which the Egyptians even at the present day celebrate a festival.” (Plutarch, Moralia V, On Isis and Osiris, 18)
“According to the principal version of the story cited by Plutarch, Isis had already given birth to her son, but according to the Egyptian Hymn to Osiris, she conceived him by the revivified corpse of her husband.”
“Osiris’ rule plays a great role in Egyptian texts. They almost always speak of him as ruler of the realm of the dead, an office he assumed only as a dead god, and almost never about his earthly kingship, which he exercised over gods and men in the world above as successor of Geb. Osiris’ reign came to a violent end as he was slain by his brother, Seth. Later Horus avenges his father Osiris’ death and succeeds him without completely destroying Seth. Thus did death come into the world, confronting the gods with a great problem. This is the prehistory of which there is no coherent narrative in the Egyptian texts (see Jan Assmann, p. 24).”
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p.s. You should read the rest of the article it is referenced.