As of now, Interface Dreams, by Vlad Hernández is free to download from Amazon (ES, USA). This is the synopsis of the book:
A novel of bravery, redemption and love in a future of fear and trans-humanism.
In the second half of the twenty-first century Havana has become a mega-city. After a bloody civil world, the old capital has emerged as Conglomerate Havana, an opulent super metropolis, the Key to the Gulf and both Americas, the new hub-for-all-cultures in the middle of the Caribbean. High towers of emergent corporations and post-national enclaves populate the skyline of the city; there, the weirdest technologies and concepts are developed and put to test, and some of them are totally illegal.Roy Cruz is a reluctant hero, only he doesn’t know it yet. He used to be a tech soldier, a former interface pilot in the war between the Western block and his economic enemies. But he is retired now, victim of obsolescence and the high speed race of optimized technologies. Since then Roy has been living a confusing life, the eagerness of his pilot interface for being connected again makes him suffer from abstinence syndrome, a sort of emptiness that makes harder for him to connect with other people.
During his stay in Conglomerate Havana, Roy and his companion, a German woman called Anna, meet by chance two girls on the run, two biotech artifacts: Two quartz novas --cutting edge tech out of control, escaping from the powerful True Confessions Corp. Inside the head of one of them there is a state-of-the-art neuro-implant, a revolutionary prototype destined to become the next new thing of the century. That means that hunters will come following the escapees, and Roy will have to face his broken humanity and take the toughest decision of his life.
Note: If you read in Spanish, you may also be interested in two these other two free ebooks by Vlad Hernández.