Piled Higher and Deeper follows the lives of two graduate students as they learn to cope with life in grad school.

The PHD Movie 2 looks at themes of competition in research, writer's block, and finding your voice. The Nameless Grad Student is now an integral part of Prof. Smith's Lab. However, the lab is in peril as research funding levels are at an all-time low. The group must travel to an important academic conference and square off against a rival group as they compete for results and grant money. Meanwhile, Cecilia's advisor is going on sabbatical, which means she has to finish writing her thesis or be stuck in grad school another year.

In The Clue of the Savant’s Thumb, Creek and fellow investigator Joey Ross (Sheridan Smith – Accused, Gavin & Stacey) are drawn into a complex case involving a secret society, seemingly supernatural events at a girls’ boarding school, and the miraculous disappearance of a body in front of three witnesses. 　　Alan Davies says: “The new story has more than the usual amount of twists and surprises, and I'm very much looking forward to sleuthing again. I can't wait to join Sheridan Smith on set again; we're very lucky to have her. It's nearly 17 years since I first auditioned for the part; the duffle coat is always on standby, even if the periods of duffle-hibernation are quite long these days”.