The Morrigan. The Solar Wind, #5

"Actually, interesting fact of bygone eras, " said Federi, "in prior centuries pirates chose their captains democratically."Radomir Lascek is in trouble. Of all the forces that are trying to take the Solar Wind out of his hands, Federi is still the most benign. The ship launches helter-skelter into space on the trail of a treasure. An ancient, Atlantean treasure; a Morrigan treasure. Against Federi's deepest misgivings about leaving Earth, and Perdita's insistence that there is no treasure, that the whole effect is a hoax.
Two Atlantean space harpies, sisters competing for the upper hand over the ship and her path; an ancient artificial intelligence whispering directly at the ship; elusive alien pests pranking the crew; an evil deity rearranging the maps, and the oxygen aboard slowly running out... He should not have antagonized Paean!But as though this is not enough, on returning home eventually, they realize they have brought something along from outer space...