FBI profiler Jenna Ramey has synaesthesia, a neurological condition that causes perceptions of colour to flash through her mind. But she has learned to understand this condition. It helps her do her job, and this time the case is a big one. A little girl with a preoccupation with numbers has witnessed a mass shooting. What she knows may be the key to finding the man responsible. Jenna has been tasked with drawing her out and figuring out what she saw...