The gang don their deerstalkers and dive into some palaeontological cold cases. Mystery and murder abound as they explore evidence for predation in the fossil record, with a supporting cast of stingrays, crabs, and some of Earth's oldest organisms. Also, James explains how terrifying the world is, Curtis reminds everyone that Deep Blue Sea is a thing, and Amanda puts the cat centre stage. References: Calderwood, J. & Sigwart, J. D. "Broken pieces: can variable ecological interactions be deduced from the remains of crab attacks on bivalve shells?" Lethaia (2016): 10.1111/let.12178. Grun, T. B.. "Echinoid test damage by a stingray predator" Lethaia (2015): 10.1111/let.12165. Porter, S. M. "TIny vampires in ancient seas: evidence for predation via perforation in fossils from the 780–740 million-year-old Chuar Group, Grand Canyon, USA." Proceedings of the Royal Society B (2016): 10.1098/rspb.2016.0221.