- Ross is a successful, happily married cardiac consultant - until his wife Fay announces she has fallen in love with the notorious womanizer Julian Kane.
- Later, Ross's assistant discovers two phials missing of Zarabell Four, a drug potentially lethal to cardiac patients.
- When Julian dies from a heart attack, all fingers point to Ross.
- But as the play progresses many enemies of the deceased are revealed and audiences will guess right up to the final moments of this well-wrought thriller.
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