Missing persons 1,714 Investigation 440 Murder 210 Large type books 153 Mystery fiction 132 Private investigators 122 Police 111 Secrecy 105 Electronic books 91 History 75 Women private investigators 72 Man-woman relationships 69 Sisters 68 Friendship 67 Families 66 Brothers and sisters 65 Crimes against 64 Family secrets 64 Women detectives 61 Suspense fiction 59 Magic 56 Kidnapping 53 Cold cases (Criminal investigation) 50 Romantic suspense fiction 47 Fathers and daughters 40 Officials and employees 39 Adventure stories 38 Mothers and daughters 36 Policewomen 35 Criminal investigation 31 Teenage girls 31 Married people 29 Serial murderers 27 Female friendship 25 Social life and customs 25 Conspiracies 24 Schools 24 Rich people 23 Young women 22 Domestic fiction 21 Psychological fiction 20 Women journalists 20 Fathers and sons 19 Good and evil 19 Historical fiction 19 Mothers and sons 19 Revenge 19 Twins 19 Women 19 Brothers 18 more ...