Well you did a great job hooking me it with that opening...I don't know much about writing but I think you could even add a bit to what you already have here, stretch it out just a tad more, maybe just a few more hints of detail about the characters or environment. But not to much as to spoil the mystery.
I love what you have done so far, you hooked me right away then drew me and and made me nearly forget about that opening sentence by the time I had finished, good stuff wolfmang! 