Mysterious events are taking place in a quiet southern boarding house. Two vacationers are found murdered. The eccentric old woman is clearly spying on someone. A spectacular lady disappears without a trace right from her room... The determined journalist Seraphima, conducting her own investigation, is convinced that the key to unraveling what is happening can be found in the will, according to which her friend, the charming Nick, inherits a priceless antique diamond from his grandfather-jeweler. However, the further she goes, the more she suspects that she shouldn’t completely trust Nick himself. Meanwhile, the mysterious killer is preparing to strike again...