Beneath the cobblestone streets and gas-lit bridges of Oakhaven, a network of brick-vaulted industrial canals connects the old water mills to the harbour locks. Bramble, a sleek river otter who wears a small copper-and-brass compass on his collar, is the unofficial guardian of the subterranean waterways.
When a rogue industrialist begins secretly installing brass clockwork valves to siphon coal runoff into the wildlife sanctuary of Oakhaven Marsh, the canal's delicate aquatic ecosystem is threatened.
Guided by the vibrations in his whiskers and his knowledge of the submerged archways, Bramble must navigate flooded locks, iron sluice gates, and mechanical traps to disable the clockwork valves and preserve the river.
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