Chemistry Professor Martin Starling has a stroke and learns he has a genetic mutation that caused the abnormal blood clot resulting in his disability. Knowing he is the product of artificial insemination, the professor turns to genealogy companies to locate unknown paternal relatives he may have, wanting to arrange for them to be tested for the mutation. He is surprised to learn he has many half-siblings. He is even more surprised to learn that someone is killing them. Could he be next?
