Some newer series I'm enjoying:
Cormoran Strike by Robert Galbraith
Bill Hodges by Stephen King
and some older ones:
Michael Connelly's (Harry Bosch and Mickey Haller)
The Hollows by Kim Harrison
Rick Riordan's series
Kensie-Genarro by Dennis Lehane
Jurrasic Park by Michael Crichton
Cassandra Clare's series
A Series of Unfortunate Events by Lemony Snicket
The Dark Tower by Stephen King
But I really like just about any series I read.