Meanwhile, Set ruled as king of Egypt; it was a time of great trouble in Egypt. Isis was stricken with grief, and put on the apparel of mourning, and cut off a lock of her hair. Then she went in search of her husband's body, as he had to be buried so that Osiris could go to the Duat, the land of the dead. Eventually, some children told Isis that they had seen the chest floating in the Nile. But Isis was delayed while she gave birth to
Horus, the son of Osiris, in Buto on the island of Chemmis. Set learned of the birth of Horus, and plotted to kill him.
Isis hid the island, making it move from place to place, and went in search of Osiris' body.http://www.jimloy.com/egypt/osiris.htmSee this exerpt too
http://books.google.com/books?id=URhBf9dMnesC&pg=PA181&lpg=PA181&dq=osiris+son+moving+island&source=bl&ots=LtVa4EZxcB&sig=Xi5jnWldt_88BxgMI34AlRFaF-A&hl=en&ei=NC3fSZrcNMfVlQe-msjgDg&sa=X&oi=book_result&ct=result&resnum=2Judgment of the Dead from the Book of the Dead
By the end of the 18th Dynasty, a similar demon appears in chapter 125 of the Book of the Dead that depicts the
judgment of the deceased before the divine tribunal. This is the better known judgment of the dead in which the heart of the deceased is weighed against the feather of Ma'at on a scale. In many cases, the Lake of Fire in Chapter 126 is also shown in this chapter. A late, Demontic text tells us that if the deceased's "evil deeds outnumber his good deeds he is delivered to the Swallower....; his soul as well as his body are destroyed and never will he breath again." In the vignette
this monster is called the "Swallower of the Damned". The demon (Ammit) is represented with the head of a crocodile, the forelegs and body of a lion and the hindquarters of a hippopotamus. The demon might also sometimes be referred to as the "beast of destiny". She usually sits near the balance, ready to devour her victim. However, since the owner of the Book of the Dead in question is naturally supposed to survive the judgment, the Swallower is almost never shown grabbing her victim.
http://www.touregypt.net/featurestories/hell.htm