This is our Abbie queen, Talia. Both cats are still being kept in, but late yesterday evening, I realised Talia wasn't to be seen. Looking around, there was absolutely no sign of her. Neither of us humans had been outside, or opened any of the external doors, since before she'd been fed.
Our conclusion is that she found the main bedroom window ajar (it was fairly muggy last night) and squeezed out onto the window ledge before jumping down onto the lawn. OK, that's onto nice soft grass, but even so, it's quite a drop, about 4 metres. And it's probably how she 'escaped' last time too, so she's doing it deliberately.
Bugger. We really don't like having to seal the bedroom in this heat.