Police are called and we begin a search for any signs ...like perhaps a Message in a bottle?
https://www.google.ca/search?newwin...X&ved=0ahUKEwiT7MWviIfKAhXEGh4KHeWzA1EQri4IHQ
Maybe instead of asking vague questions you actually state who's missing and how you could potentially contact them.
Almost every product on the store has its own support thread. How about starting there and seeing if there's any update from said developer.
You know, that it is Christmas and New Year time? Ppl are usually with their families and not working.