The world's greatest detective is back in the fourth instalment in a brilliantly clever, funny and highly illustrated murder mystery series. Shenanigans are once again afoot in the town of Widdlington, and this time they're on board the Dreadnowt – a galleon ship that’s set to host a fireworks display for the town. Bonnie Montgomery and Grampa Banks are on board as guests, but just after sundown, a fog rolls in and a terrible cry is heard over the crash of the waves. Captain Valancourt stumbles out of the mist, dripping wet and covered in red welts, the like of which a sea monster would leave behind, and is soon pronounced dead by the doctor on board. The crowd is shocked, and Bonnie's fishy-o-meter is off the charts.