TAP. TAP. It's a funny thing about fish. They are often considered stupid and useless creatures. For example, I once asked my mother-in-law why she didn't leave plants or toys in her aquarium for her clownfish to explore. “Well, what's the point?” he told me. “Fish only remember things for three seconds anyway.” Then she smirked as if she were the world expert in the cognitive abilities of fish. I have since learned to ignore my mother-in-law's crazy flattery, fish are actually one of the most intelligent and fascinating creatures in the world. In fact, they have an excellent memory. Therefore, it was very unusual when Belial woke up in his tank to hear a strange rattling sound without remembering ever hearing it before. Yet it was difficult for him to become truly curious because he was adrift in that strange torpor of sleep where one is trapped in a land halfway between dreaming and waking.TAP. TAP.We didn't know how long the noise had been going on for. It was like when you're in bed waiting to succumb to sleep and suddenly you notice a drop dripping...