Help me find my leak

[nosoule46]

We have 05 X3 that is allowing rain water into the car. Specifically the water accumulated on the driver's side, rear at carpets. Enough was to soak a handtowel.

I had thought the washer fluid was re-leaking but now I know it was the rain.

This is the second time now after a rain storm. I noticed it as the condensation was building up on the Inside of the car.

I am guessing it may be coming down from the driverside B-pillar and into frame/floor but have no ideas. We have the moonroof.

Thanks