Rain Wild Chronicles #4: Blood of Dragons book by Robin Hobb

Dragons will fly over Kelsingra once more. The Tarman expedition has at last found Kelsingra, a city filled with ancient treasures. Here, the dragons and their Elderling keepers may discover their full potential, but only if the magic of Kelsingra can be unlocked. Already rumours of the city have floated down the Rain Wild River. Adventurers, pirates and fortune hunters will soon be coming to pillage what they can. Meanwhile, Selden Vestrit finds himself a prisoner of the ailing Duke of Chalced, who believes him to be a dragon-man whose flesh and blood may work miracle cures. Published By Voyager on 2016-02-18