A Suzie Fewings genealogical mystery - Nick Fewings, the husband of keen family history researcher Suzie, inherits a portrait of his great-grandfather, a famous lifeboatman in St Furseys. Nick and Suzie are keen to find out more, so they decide to take their two teenage children, Tom and Millie, on holiday there. The family stay with Nick's brother Leon and his daughter Anna, and the teen girls' imaginations are soon fired by tales of smugglers on the coast. They are delighted when Nick discovers that his ancestors once owned the Noah's Ark Inn, an old smuggling haunt, but when he and the girls visit they are chased off by its seemingly unbalanced owner. Then one afternoon the girls go missing. Tom thinks they've gone to search for smugglers, but the others aren't so sure. Could the girls have returned to the inn and run into trouble? Or does an offshore archaeological-survey vessel hold the answers? Either way, night is falling and the clock is ticking . . .