meitantei conan and kindaichi shounen no jikenbo - meguriau futari no meitantei

twilight island, one of japan's tourist hotspots during the summer, has become the source of a disturbing rumor as of late. it tells of several visitors being spirited away to another place, which at first sight seems to be the same island, but is in fact fundamentally different, as if it was lost in time. these missing persons eventually do return safely, just as mysteriously as they disappear, however the rumor was enough to spook some of professor agasa's colleagues into cancelling their vacation there. the professor has come handsomely out of this situation with some spare tickets and, knowing conan's interest in such riddles, has suggested that they go in their stead. fait accompli, and now the whole gang, besides them including detective kogorō mōri, his daughter ran, and conan's friends from elementary school, are off to unravel the island's mysteries.