Doorport – Scott Michael Decker

Engineer Janet Thompson steps through a Doorport to San Diego, but lands in San Francisco instead. The worldwide Doorport network has operated without a glitch for forty years. What can possibly be going wrong?
The lives of six people change in dramatic ways, and as Janet tries to revamp the 40-year old Doorport system, she realizes that years of use have begun to have an effect on our world.
When the space-time permutations become more numerous and pervasive than she could have ever imagined, Janet must save our dimension from complete collapse.