After a building explosion at a mining facility, the DTI corporation announces that it was caused by a malfunction in a cooling system. Jack and Rowe receive a tip off from Mark/Margaret that the explosion was deliberate, then DTI's executive director Taylor's car is bombed and Cloud 7 suspect the bomber called Angel. They are assigned to investigate, however Frost, Director of DTI's Information Management Division, says that they will handle it themselves. Nevertheless they examine a bomb threat note, which the DTI executive Claudia suggests means Sunday at midnight. Jack reveals to Rowe that he and Claudia were partners some years ago, but suspects that she is the bomber. She admits her attack on DTI because of its unprincipled practices, but she is then shot dead by one of their agents.