The Infernal Devices

The Infernal Devices is a series of novels by author Cassandra Clare, centering on a race called the Shadowhunters introduced in her The Mortal Instruments series. The series is a prequel series to the Mortal Instruments series, and contains some of the character's ancestors. Clare has insisted that the two series can be read in either order.

Question: are the mortal instruments and infernal devices connected
Answer: yes