S.F. Masterworks No Enemy But Time - Michael Bishop (Paperback) 08-08-2013 Short-listed for John W Campbell Award 1983 (UK) and British Science Fiction Association Award for Best Novel 1983 (UK).
Joshua Kampa is torn between two worlds - the Early Pleistocene Africa of his dreams and the 20th-century reality of his waking life. These worlds are transposed when a government experiment sends him over a million years back in time. Here, John builds a new life as part of a tribe of protohumans. But the reality of early Africa is much more challenging than his fantasies. With the landscape, the species, and John himself evolving, he reaches a temporal crossroads where he must decide whether the past or the future will be his present.