The Wave Traveller — P.R. Morrison

It has been over three months since Archie Stingweed defeated Huigor and the terrible curse on his family. Lately however, Archie has been noticing more strange things around his island home like menacing sea creatures, mysterious sounds and unusual shadows. Even Archie's uncle Rufus is acting strange. When the strange phenomenon starts to intensify, Archie finds out he will have to battle another powerful curse. Only this one has the ability to bring Huigor back
Archie will have to summon all of his strength and intelligence to exterminate this curse and save his family and friends from a terrible fate.