A little extra something must be in the water over at the PBS Masterpiece world control center. Consider for a minute that, just this past year, the series has showcased the likes of Downton Abbey, Great Expectations, Birdsong, Upstairs Downstairs, Case Histories, Page Eight, Endeavor and Inspector Lewis. It just keeps getting better and better with new episodes of Upstairs Downstairs, Downton Abbey and Sherlock in the foreseeable future along with Silk, new episodes of Case Histories and Endeavor in the works.

In the immediate future, however, it’s time to turn our attention to Inspector Lewis. The first of four new episodes premiere tonight and run through July 29 on PBS. Hopefully, you were able to catch the pre-Inspector Morse one-off, Endeavor, last week which set the stage brilliantly for the next four weeks of a present day Inspector Lewis. Kevin Whately (Inspector Lewis) and Laurence Fox (Detective Sergeant Hathaway) again find themselves dealing with murder and mayhem in the academic world of Oxford while trying to adjust to a new DI.

Masterpiece Mystery! Inspector Lewis “The Soul of Genius” – Tonight at 8:00p CT/9:00p ET on PBS

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When the body of an obsessive Oxford English professor is found, Lewis and Hathaway are set upon a seemingly impossible quest to uncover the truth. James Fleet (Little Dorrit) and Celia Imrie (Cranford) guest star.

Masterpiece Mystery! Inspector Lewis “Generation of Vipers” – July 15 at 8:00p CT/9:00p ET on PBS

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Suspicions abound as Lewis and Hathaway investigate the death of a lovelorn Oxford professor. Was her death caused by an embarrassing Internet leak, or something much more sinister? Toby Stephens (Jane Eyre) guest stars.

Masterpiece Mystery! Inspector Lewis “Fearful Symmetry” – July 22 at 8:00p CT/9:00p ET on PBS

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Lewis and Hathaway are drawn into a darker side of Oxford while investigating the murder of a suburban babysitter. Will the babysitter’s secret life help the detectives unravel a tangled web of lies and deceit to find their killer?

Masterpiece Mystery! Inspector Lewis “The Indelible Stain” – July 29 at 8:00p CT/9:00p ET on PBS

Watch Inspector Lewis: The Indelible Stain Preview on PBS. See more from Masterpiece.

A controversial American academic is found strangled after a guest lecture at Oxford, leading Lewis and Hathaway to narrow down a list of motives that includes politics, ambition and vengeance, in order to find their culprit. David Soul (Starsky & Hutch) and David Calder (Bramwell) co-star.