The novel “Convergence” by Charles Sheffield was published for the first time in 1997. It’s the fourth book of the Heritage universe and is the sequel to “Transcendence”. It’s also part of the omnibus titled “Transvergence” together with the previous one.

Louis Nenda and Atvar H’sial are back from Genizee, the Zardalu homeworld, but they find something strange. The Artifacts have an estimated age in millions of years but they seem to have suddenly started becoming active. To understand what’s happening, they look for Darya Lang, an expert of the Builders, because they already worked with her in various adventures.

Darya Lang has just returned from Genizee when she happens to see a part of a conference of Quintus Bloom, another Builders scholar. Bloom thinks that those mysterious aliens are actually the humans descendants who have sent the Artifacts back in time from a distant future. To discover the truth, Darya Lang and some old friends go back to study some Artifacts but the changes taking place are making them more dangerous than ever.