Hazel Heald & H.P. Lovecraft 
Out of the Aeons [EPUB ebook] 

In 1879, a freighter captain discovered an uncharted island, presumably risen from its sunken state due to volcanic activity. From it, he recovered a strange mummy and a metal cylinder containing a scroll. A year later, the mummy is put on display in the museum, and the island mysteriously vanishes without a trace…