In 2013 they began writing for the first season of an FX adaptation of The Strain which concluded with the fourth season in 2017 .
The Strain is a horror novel by Guillermo del Toro and Chuck Hogan .
In 2013 they began writing for the first season of an FX adaptation of The Strain , a horror novel by Guillermo del Toro and Chuck Hogan , which concluded with the fourth season in 2017 .