Handsomedan:
Opening the boot of my wife's car and discovering a "little bit of moisture".
Lifted the floor of the hatch and the spare wheel well was full to the brim with water!
Pulled everything out, yanked out the bung and got all the water out, but it's clearly been in there a while.
Have dried it as much as possible, but finding the source of the leak is proving to be difficult. No tell-tale signs of leakage.
Could she have driven through a deep puddle at some point?