Traceroute should nail down the ISP and possibly enough info for the ISP to track it down, but you need law enforcement to get further I guess. Personally, I'd

Traceroute should nail down the ISP and possibly enough info for the ISP to track it down, but you need law enforcement to get further I guess. Personally, I'd rather have full disk encryption and password login to prevent them even getting far enough for a network connection to be there.