Everyone knows that the reclusive detective, known only as L, is one of the greatest minds the world has ever known. What the world doesn't know is that he is only twelve years old. The ICPO approaches L about the murders of four single parents from four different countries whose children have since gone missing. L dismisses the case as too insignificant until he meets the boy who is making this case a whole lot more complicated. Michael West, age 12, was raised by his adult sister until she seemingly committed suicide. A cryptic message left at the crime scene seems to indicate that she was yet another victim of this case, soon to be called the Triebome Murder Case. After his sister's death, Michael is transported to Wammy's House for safety, where he takes on the alias of Nurse. After a rather embarrassing incident where L become so involved in a case that he goes a little too long without eating and passes out, Nurse is assigned to be L's roommate and ordered to keep an eye on him - much to the dismay of both boys. L brings Nurse onto the case in the hopes that he will be able to shine some light on the evidence. Can Nurse and L solve the case?