The first installment of the popular 'Lesson' series—featuring therapist, professor, and reluctant sleuth, David Unger.

Sex, Murder, and Videotapes—join David Unger as he tackles his very first murder mystery

When David is drafted at the last minute to cover a class on Human Sexuality, he prepares by attending a Sex Therapists conference, where a fellow attendee confides that she's being blackmailed over illicitly obtained sex-tapes.

Things take a sinister turn when murder is thrown into the mix, and as David fumbles his way through his first mystery, he discovers he has a talent for sleuthing—and for finding himself in sticky situations.

As the net closes in on the killer, dark secrets are revealed and inventive interrogation methods must be created. David needs to use all his therapeutic skills to unravel the mystery and recover the tapes—and work out how best to respond to some unexpected flirtations.

Is romance in the cards for David?
And can he identify the killer amid a muddle of accusations?