[I received a copy of this book through NetGalley, in exchange for an honest review.]
A coming-of-age adventure in a world that is both threatening and full of wonders, following a boy who embarks on a journey to save his father: after Wulliam witnessed his dad being possessed by a river spirit, he decides to take his only parent to the sea, hunting down a legendary beast whose fluids are rumoured to have many healing properties. And even if it means abandoning his duties as the keeper of the river, Wull feels he doesn't have a choice: either that, or let his father wither and die.
There were quite a few magical, poetic descriptions and moments in this book, and I never found it hard to picture the characters' surroundings, or to imagine the mormorach, diving in the dark waters, preying on ships and crews bent on taking it down. Nor was it hard to imagine little Bonn, or Tillinghast's strange body (bodies?).
However, I was a bit disappointed in the “adventure” itself, for it was rather sluggish in more than one place, and some events and character arcs felt put on a bus after a while. Most of the people Wulliam meets have their quirks and an aura of mystery: from the undertaker to Tillinghast the man who's not alive, from Mix and her strange tattoos to Remedie cradling her strange baby, from the solitary scientist in the Deadmoor to the silent Mr Bent. The problem is that some of those people were given their own adventure... yet said adventures were never really concluded: only Wull and Tillinghast seem to have an ending of their own (as well as a few other characters, but let's just say that their ending is a little more, uhm, permanent). As a result, it felt less like an open ending, and more like the author wanted to get to Wulliam's ending mostly, with his quest being a little... on the side? I may be mistaken, but that's how I keep on feeling about it now. I still don't know why Mix doesn't eat, or what happened to Remedie and Bonn.
Wulliam was also pretty annoying as a character. On the one hand, I could understand his desire to save his Pappa, along with his underlying somewhat selfish reasons (he wants to save him because he loves him, of course, but also because he doesn't know how to be the Riverkeep in his stead, and wishes for his guidance some more); I could also understand how he'd come to be angry, considering everybody seemed to hitch a ride and not lift a finger to help. On the other hand, well... those characters helped in different ways (Till does pay for the trip, after all, and Mix does have a knack to gather resources unseen), and Wull after a while became more the annoying, tantrum-throwing type than the rightly-annoyed, unfairly-treated one.
Conclusion: ~ 2.5 stars out of 5. I liked the atmosphere, the depiction of the river and of the places travelled in this novel. Nevertheless, the pace was rather uneven, and unless it's the first book in a series and we're bound to learn more in a second one, not bringing closure to other characters' stories made me feel unsatisfied.