'A Thief in the Night - A distant Thunder'

A friend told me about "A Thief in the Night" and it sounded interesting. I surfed the Internet and found a comment about "A Distant Thunder" that it is in fact one of four films (this one being the sequel to "A Thief in the Night"). Can anyone please tell me the names of the other films in the series and where I might be able to get hold of VHS/DVDs of these? Thanks.