Loss Protocol by Paul McAuley ( Gollancz , £22 ) In a Britain racked by the effects of climate change, about 50 years from now, Marc Winters’ quiet life as a ranger on a nature reserve in Essex is about to be disturbed. Counter-terrorism officers arrive to question him about events from eight years before, when a cult his sister Izzy was part of had self-immolated. He’d hardly been aware of this group of “deep dreamers”, who thought they could change the world through a sort of mental time travel enabled by psychotropic mushrooms. But now both government agents and deep dreamers alike think Izzy must have passed some vital information to her brother, whether he knows it or not. With no idea of the existential danger he faces, Marc sets out to investigate. Beautifully written, blending close attention to the natural world with hallucinogenic dreams and a mind-boggling premise, this is an eco-thriller like no other from one of Britain’s best SF writers.…