The Sailplane

After serving 26 years in prison, a demolition expert sets about the task of killing the man whose testimony helped to put him behind bars. Two explosions at Spencer Aviation have the look of sabotage. Someone is out to get Spencer. This is deduced from the fact two explosions rip part of the Spencer Aviation facilities in a short period. In addition, there is a suspicion that a bomb may be rigged to Spencer's sailplane.