The Awakening - Glimmer in the Dark - Book 1 by OnlyTheGhosts

Erotic horror story set a few years into the future of a world much like ours, with a slightly different history. Shine Malloy is a very shy teenage girl whose family migrated from the "American Union" to the city of Tearmann on Australia's south-east coast following a nuclear terrorist attack that destroyed San Francisco. She's been having nightmares that are disturbingly erotic, filled with warnings. Meanwhile, three detectives, Topper, Kane, and Yamamura, are part of a secretive police task force that's trying to catch a mysterious serial killer and rapist that has been terrorising the city for months.