25 years and still missing: the disappearance of Nick and Lisa Mase

It has been 25 years since Nick Maseand his wife, Lisa, went missing and their disappearance has left his two children, Nick MaseJr., and sister Tanya MaseVan Ravenzwaaij confused and heartbroken.

The siblings, along with North Vancouver RCMP, held a press conference Tuesday to appeal to the public for new information. They also announced they're increasingthe reward money from $25,000 to $50,000.

"Perhaps the time that has gone by would allow somebody to come forward now, that otherwise might have remained silent in the past,"Nick MaseJr. told reporters.

OnAugust 10, 1994, the day before they were last seen, the Mases were meant to meet a millionaire investor at Trader Vic's restaurant in downtown Vancouver, said North Vancouver RCMP Sergeant Peter DeVries.

DeVries said police know that meeting never happened.NickMase, a retired banker,was 55 at the time and his wife was 39.

On August 11, Lisa Mase made two calls to her boss,and her husband's business partner to say they'd be away for a few days. No one has heard from them since.

DeVries said police later found zap straps plastic handcuffsat the Mases' home.

"The facts did not allow investigators to determine conclusively if they had been kidnapped, or murdered or the victims of some other crime," DeVries said.

Policebelieve the couple died as a result of a criminal act.

"There's the logical part that tells you that they can't be in hiding and then there's a part of you in your heart that wants them to still be living," saidTanya MaseVan Ravenzwaaij.

DeVries said there are no new leads in the case.