Lila Black is a high-price cyborg special agent. She used to be a regular human, but after a disastrous encounter with someone from a parallel realm, she nearly died. Then she was rebuilt, at huge expense, and is now being sent by her government intelligence agency to be the bodyguard of Zal, an Elfin rockstar who has received some threatening letters. Things get complicated when Zal and Lila become involved in Elfin politics.
Justina Robson’s Keeping It Real has an intriguing premise: a nuclear bomb explosion in 2015 opened up the fabric of the universe and made five parallel worlds accessible to each other.