Brilliant aspiring scientist Sabrina has won a scholarship to study chemistry at a prestigious London university. Best of all, it includes accommodation in the Infaustus Apartments, where the university's richest students are housed in luxury. But life in London is expensive, so Sabrina takes a job cleaning the residence. Invisible in her cleaner's uniform, Sabrina discovers all her classmates' dirty little secrets. However, Sabrina's life soon gets very messy when she discovers the dead body of rugby star, Chase Matthews. All the residents are suspects, and Sabrina knows better than most that everyone has a motive to want Chase dead. Trying to keep investigations away from her own past, Sabrina must use all her smarts to expose the killer before she ends up as their next victim.