Tally, I have had exactly the same problem as you, in exactly the same place. Over the course of the past week, I applied waterproof duct tape to various gaps around the roof, hatch and glass in an attempt to identify where the water was getting in. After several heavy rainfalls and continued leaks, I have finally traced the problem area to the top of the offside rear door frame. The rain stopped penetrating after I had placed the duct tape over the gap between the roof and the top of the offside rear passenger door. The rubber strip there seems to be making an imperfect seal at that point, allowing rainwater to seep through and collect at the top of the hatch and through into the rear seating area. I am now wondering about the cure. Will take it to a local garage for their suggestion. Maybe some sealant will do the trick. Hope this is of help to you.