The family of a North Vancouver couple that vanished from the area in the summer of 1994 is still searching for answers.To mark the 25th anniversary of Nick Masée Sr. and Lisa Masée’s disappearance, their children, Nick Masée Jr. and Tanya Masée Van Ravenzwaaij, are renewing their public appeal for help with a case that has baffled investigators for a quarter-century.“The evidence surrounding the disappearance of Nick Masée Sr. and Lisa Masée was never quite sufficient to lead us to say conclusively that they vanished because they were victims of a crime,” said North Vancouver RCMP spokesperson Sgt. Peter DeVries. “The circumstances were mysterious. Some of the details were concerning. But the facts did not allow us to determine conclusively if they had been kidnapped, or murdered, or the victims of some other crime.”In investigating the bizarre case, Mounties followed numerous leads in the weeks and months after the Masée’s disappearance, finding little beyond more questions.Police learned that in April 1994, the Masées took a secret trip to the Cayman Islands. And on Aug. 10, 1994, the day before they disappeared, the couple had planned to meet a millionaire investor at Trader Vic’s restaurant in downtown Vancouver. The meeting never happened.A search of the Masée’s home also turned up zap straps, puzzling Mounties who still believe the couple were the victims of a deadly crime.“Based on a consideration of the length of time that has passed, on our inability to uncover any evidence verifying the Masées are still alive, and in light of the concerning circumstances surrounding their disappearance, we are affirming our position in this case,” said DeVries. “We presume Nick Masée Sr. and Lisa Masée to be deceased, and that their deaths were the result of a criminal act.”But that’s hardly enough for the Masée’s children, who remain committed to learning the truth about their parents’ disappearance, which has left them confused and heartbroken ever since.They have not given up. On Tuesday, in an effort to reignite interest in the unsolved mystery, the Masée children announced that they are offering a $50,000 reward for information in the case.