The Luck of Han'anga - War of the Second Iteration, Book One
by Thomas Watson
For hundreds of years the Commonwealth has expanded into space, seeking another intelligent species to no avail. Then they found the Leyra'an, a species so much like Humanity it defied belief. But before this mystery can be resolved, there is a darker matter to be dealt with. For someone else found the Leyra'an first, and started a war.