IDENTICAL MURDERS COMMITTED ON OPPOSITE SIDES OF THE COUNTRY DRAW MULDER AND SCULLY INTO A DARK EXPERIMENT IN HUMAN GENETICS.
Young Teena Simmons is the only witness to her father's bizarre death: His body is found drained of blood after she sees 'red lightning'. Suspecting alien involvement similar to the cattle mutilations plaguing the Western U.S., Mulder and Scully look into the murders. But they are stunned when a second, identical murder on the opposite coast of the U.S. turns up an identical witness: The two girls appear to be twins. Deep Throat provides Mulder and Scully with access to a psychotic with inside information about a fertility clinic and a possible experiment in genetic manipulation dating back to the Cold War. When the girls are kidnapped, Mulder and Scully suspect a maverick clinic doctor who may herself be a result of bizarre genetic experiments. The team must untangle a complicated web devised by two deranged minds to discover the shocking truth about the twins.