Portal

Portal completes Eric Flint's and Ryk E. Spoor's Boundary trilogy. This book starts precisely where Threshold ends, making it a continuation of that story. The crew of the crippled Nebula Storm and the survivors of the Odin find themselves shipwrecked on Europa. They have a lot of adventures, many of the do-or-die sort, as they struggle to survive in a hostile environment and to get back home. The mix of engineering, space flight, paleontology, biology, physics, and a surprising first-contact situation makes for a fun read.
Interesting SF; good book.