''Summertide'' (1990) is a

science fiction Science fiction (often shortened to sci-fi or abbreviated SF) is a genre of speculative fiction that deals with imaginative and futuristic concepts. These concepts may include information technology and robotics, biological manipulations, space ...

novel by American writer

Charles Sheffield Charles Sheffield (25 June 1935 – 2 November 2002), was an English-born mathematician, physicist, and science-fiction writer who served as a President of the Science Fiction and Fantasy Writers of America and of the American Astronautical ...

, the first of his series of

Heritage Universe Heritage may refer to: History and society * A heritage asset is a preexisting thing of value today ** Cultural heritage is created by humans ** Natural heritage is not * Heritage language Biology * Heredity, biological inheritance of physical c ...

. The story takes place millennia in the future, with humans having extensively colonized our

spiral arm Spiral arms are a defining feature of spiral galaxies. They manifest as spiral-shaped regions of enhanced brightness within the galactic disc. Typically, spiral galaxies exhibit two or more spiral arms. The collective configuration of these arms i ...

of the

Milky Way The Milky Way or Milky Way Galaxy is the galaxy that includes the Solar System, with the name describing the #Appearance, galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars in other arms of the galax ...

and having encountered a number of intelligent

alien race Alien primarily refers to: * Alien (law), a person in a country who is not a national of that country ** Enemy alien, the above in times of war * Extraterrestrial life, life which does not originate from Earth ** Specifically, a lifeform with e ...

s. Littered throughout the

galaxy A galaxy is a Physical system, system of stars, stellar remnants, interstellar medium, interstellar gas, cosmic dust, dust, and dark matter bound together by gravity. The word is derived from the Ancient Greek, Greek ' (), literally 'milky', ...

are hundreds of massive abandoned engineering projects built by a mysterious race, referred to as The Builders, extinct for three million years. An eclectic group of scientists and opportunists are descending upon one such artifact at a time when its surrounding environment is extremely dangerous to study an unusual phenomenon. The novel includes excerpts from the ''Lang Universal Artifact Catalog (Fourth Edition)'', describing several Builder artifacts. ''

Divergence In vector calculus, divergence is a vector operator that operates on a vector field, producing a scalar field giving the rate that the vector field alters the volume in an infinitesimal neighborhood of each point. (In 2D this "volume" refers to ...

'' is the next book in the series.

Reception

Kirkus Reviews ''Kirkus Reviews'' is an American book review magazine founded in 1933 by Virginia Kirkus. The magazine's publisher, Kirkus Media, is headquartered in New York City. ''Kirkus Reviews'' confers the annual Kirkus Prize to authors of fiction, no ...

'' calls it an "above-average space opera", while ''

Publishers Weekly ''Publishers Weekly'' (''PW'') is an American weekly trade news magazine targeted at publishers, librarians, booksellers, and literary agents. Published continuously since 1872, it has carried the tagline, "The International News Magazine of ...

'' states that the "'series stands on its own, even though many threads are left dangling."

References

1990 American novels Novels by Charles Sheffield 1990 science fiction novels American science fiction novels {{1990s-sf-novel-stub