'Invasion' (1975) by Aaron Wolfe (AKA Dean Koontz)

'Invasion' (1975), written by Dean R. Koontz under the pseudonym Aaron Wolfe, is a tightly written science fiction novel that presents a chilling alien invasion story centered on a family isolated during a severe snowstorm.

The narrative, set in a remote location, builds suspense through the discovery of strange tracks, anomalous lights, and the increasingly erratic behavior of animals, culminating in a tense and suspenseful confrontation.

The novel is noted for its excellent pacing, tension, and surprising plot twists, with many readers considering it a standout early work by Koontz, despite its origins as a pulp-style "Laser Book" series.

The story is a quick, enjoyable read that effectively blends science fiction with elements of horror, creating a creepy and suspenseful atmosphere.

It was one of Koontz's early works, published as his 32nd book, and is considered by some to be one of his finest first novels, though it was not his first published work.

The novel was later expanded and re-tooled into the 1994 novel Winter Moon, which offered further development of the original ideas, though many readers still prefer the tighter execution of the 1975 version.

The book is part of the Laser Books series, published by Harlequin, which featured science fiction stories with strict guidelines on content and length, and was illustrated with distinctive covers by Kelly Freas.

While some reviewers found the writing occasionally repetitive or the ending weak, the overall consensus is that 'Invasion' is a well-crafted, fast-paced thriller that holds up well as a classic of its genre.