What happens when the world’s greatest detective and the world’s greatest psychoanalyst team up to solve a case neither one of them can solve alone? There’s fun galore in “The Seven-Percent Solution”, Nicholas Meyer’s artful takeoff on literature’s most famous detective creation, Arthur Conan Doyle’s Sherlock Holmes. We know from Conan Doyle that Holmes had a cocaine habit; as Meyer’s book opens, we see Holmes in a cocaine-fueled fit of paranoid delusions that the evil Moriarty is after him again. Dr. Watson consults with big brother Mycroft Holmes, who confides to him that Moriarty used to be their math tutor, no more, no less, and is concerned that little brother Sherlock’s cocaine addiction is spinning out of control. Between them, they find a way to finesse Holmes into going to Europe to be treated by Sigmund Freud, who has been doing remarkable work with cocaine addicts, but first they have to convince Holmes that they are on the track of the nefarious Moriarty. After a hilarious chase led by a slightly wonky bloodhound with a special taste for vanilla extract, Holmes and Watson end up at Freud’s front door, and Holmes enters seven agonizing days of enforced cold turkey.Holmes emerges clean, sober, and distanced from everything, and part of his cure to jerk him back into reality involves bringing him into the case of a young woman Freud is treating for symptoms of hysteria. A quick survey of the patient is enough for Holmes to realize that some dicey doings are afoot, and that this is just the tip of the iceberg, the iceberg being a plot to involve all of Europe into a continent-wide conflagration. But just as Freud is impressed with Holmes’ crime-solving abilities, Holmes is impressed with Freud’s ability to read the perpetrator’s mind, and he gives Freud what is meant as the ultimate compliment: “You have taken my methods, observation and inference, and applied them to the inside of a human head.” (Actually, Holmes’s methods were observation and deduction, but who wants to cavil here?) Holmes, Watson and Freud work together to solve the problem, and the payoff is Freud’s request to hypnotize Holmes in order to be able to see into his head. What’s inside there is a revelation, and as Meyer explains Holmes to us, we understand his solitary life, his avoidance of women, his loathing of Moriarty and why he chose his singular profession to begin with. Meyer’s book is great fun and fairly accurately follows the narrative style of Dr. Watson. Imitation may be the sincerest form of flattery; Conan Doyle would have loved it.