Please Help!!!

I somehow lost my regular recipe for chocolate cheesecake in my last move. It was from a small book of cheesecake recipes called "The Perfect Cheesecake". I bought it in a little tearoom and gourmet cooking store in Portland Oregon about 10 years ago. Among the recipes included one for Pumpkin cheesecake, a fruit melange cheesecake, and a ricotta cheesecake. But my favorite was called Chocolate Velvet Cheesecake. I have searched the web and found a recipe by the same name, but it is nothing like this decadant delight. Clues I remember are that the crust is made with chocolate cookie crumbs, and includes a hint of cinnamon. Unsalted butter is used in the crust as well. The only other clue is that the recipe used cocoa powder in addition to melted semi-sweet chocolate in the filling. It called for heavy cream, not sour cream, and I think there were 4 or 6 eggs. I've found several recipes on the web that were close, but not quite the right one. If anyone has this recipe or cookbook, could you PLEASE post here ASAP. I always make it for my co-workers for my birthday on October 28th

Thanks,

Lynne