Strictly speaking, time travel is fantasy, not science fiction as, using plain logic, we can easily prove that practical time traveling is impossible. This distinction here between scifi and fantasy is an important one, as then we can relax the constraints of what we will consider believable and what is, well, just pure fantasy. The question then becomes which of the time traveling flavors will the author pursue, and do we maybe get a novel twist on it. The most fascinating bit for me about time travel fiction is how will the author try to avoid bumping into the causality paradoxes face on, and i think “Recursion” does a pretty good job at it. In the recent years there have plenty excellent books and TV series (12 monkeys, for one, was holding strong all the way up to season 4 or so), two other easy recommend books in the category are Annalee Newitzes “The Future of another timeline”, and “The First Fifteen Lives of Harry August” by Claire North.