While terrible in nature, there’s always a curiosity towards serial killers, even if only in hope to identify and protect one’s self from a potential one. The Young Poisoner's Handbook depicts one such killer named the Teacup Murderer, but while the usual serial killing tropes are present (e.g. the fascination towards death, the disregard for others, and the possible psychosis), the film is equal parts creepy and funny. It doesn’t really delight in the gore, with poison as his weapon, but it mostly takes pleasure in how captivated he is with his experiments– the meticulous method he recorded, the thought he placed into his endeavors, and the way he was able to escape detection, even from those who knew him. One should obviously not follow The Young Poisoner's Handbook, but one can’t deny how Hugh O’Conor makes said poisoner a fascinating watch.