Darkmouth: the Legends Begin by Shane Hegarty
"There are towns where the border between our world and the world of monsters--properly called legends--is thin. One of those towns is Darkmouth. There, our hero Finn is the son of the last remaining Legend Hunter--which means that one day soon he will be the last remaining Legend Hunter. Except...he's a bit rubbish at it. And in a spectacularly unfortunate coincidence, the terrifying leader of the monsters is in the midst of planning an all out attack on Earth...in Darkmouth."
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