Shock to the System: A Donald Strachey Mystery(2006)

Some secrets kill.

When hard boiled private eye Donald Strachey finds his latest client dead, an apparent suicide, Albany’s favorite gay detective smells a rat and decides to take matters into his own hands. With the help of his straight-laced but adoring husband Tim and his occasionally too-eager assistant Kenny, Strachey’s investigation leads him on a dark and dangerous trail into the world of "gay conversion therapy".