Book 3 of The Seamen Sexology takes François and his salty seamen to the Nether Lands, home to fertile bogs and the Great Dyke Army.
When De Cocksdorp’s head dyker, Joosie Twaat, wakes to find her finger has been sloppily inserted in her own now-leaking dyke, François and his crew immediately come on De Cocksdorp to help. But small leaks become large leaks, and large leaks become gushes, and before long, Joosie’s gaping dyke threatens to flood the whole town.