Conundrum - An Iris Reid Mystery, #1

When a Harvard Architecture School superstar plunges off the balcony at a graduation party, the police see an accident, not foul play. Butfellow-student IRIS REID knows that any jealous member of the ruling clique would have relished pushing him off. Twenty years later, a reunion is luring the same cast of characters back to Cambridge. The opening night dinner is being held in a Modernist house that Iris designed.
She hopes to untangle the events that led to her friend's death. But the murderer has other plans. When a long-ago boyfriend turns up dead the night of the dinner, all the incriminating evidence points to Iris. What began as an attempt to avenge her old friend turns into a desperate race to avoid being framed by the clever killer-a killer capable of twisting the truth into a bloody conundrum. "An exciting, engrossing tale of greed, deceit and murder." THE KIRKUS REVIEW