The story of a multigenerational colony ship, which is interrupted part way through it's millenium-long voyage when it encounters other earth ships that got there before them, though starting long after. This is pretty well done for a first novel, though it did drag in places and I felt like the final resolution was a bit contrived. The Pope??!!
The characters were generally pretty well drawn, but I lost track of some of them toward the end -- maybe because it took me so long to read.
However, I wouldn't mind recommending it to space lovers.