| Number | Title | Published |
|---|
| 20 | The Haunted Cabin Mystery | 1991 |
|---|
| 21 | The Deserted Library Mystery | 1991 |
|---|
| 22 | The Animal Shelter Mystery | 1991 |
|---|
| 23 | The Old Motel Mystery | 1991 |
|---|
| 24 | The Mystery of the Hidden Painting | 1992 |
|---|
| 25 | The Amusement Park Mystery | 1992 |
|---|
| 26 | The Mystery of the Mixed Up Zoo | 1992 |
|---|
| 27 | The Camp Out Mystery | 1992 |
|---|
| 28 | The Mystery Girl | 1992 |
|---|
| 29 | The Mystery Cruise | 1992 |
|---|
| 30 | The Disappearing Friend Mystery | 1992 |
|---|
| 31 | The Mystery of the Singing Ghost | 1992 |
|---|
| 32 | The Mystery in the Snow | 1993 |
|---|
| 33 | The Pizza Mystery | 1993 |
|---|
| 34 | The Mystery Horse | 1993 |
|---|
| 35 | The Mystery at the Dog Show | 1993 |
|---|
| 36 | The Castle Mystery | 1993 |
|---|
| 37 | The Mystery of the Lost Village | 1993 |
|---|
| 38 | The Mystery of the Purple Pool | 1994 |
|---|
| 39 | The Ghost Ship Mystery | 1994 |
|---|
| 40 | The Canoe Trip Mystery | 1994 |
|---|
| 41 | The Mystery of the Hidden Beach | 1994 |
|---|
| 42 | The Mystery of the Missing Cat | 1994 |
|---|
| 43 | The Mystery on Stage | 1994 |
|---|
| 44 | The Dinosaur Mystery | 1995 |
|---|
| 45 | The Mystery of the Stolen Music | 1995 |
|---|
| 46 | The Chocolate Sundae Mystery | 1995 |
|---|
| 47 | The Mystery of the Hot Air Balloon | 1995 |
|---|
| 48 | The Mystery Bookstore | 1995 |
|---|
| 49 | The Mystery of the Stolen Boxcar | 1995 |
|---|
| 50 | The Mystery in the Cave | 1996 |
|---|
| 51 | The Mystery on the Train | 1996 |
|---|
| 52 | The Mystery of the Lost Mine | 1996 |
|---|
| 53 | The Guide Dog Mystery | 1996 |
|---|
| 54 | The Hurricane Mystery | 1996 |
|---|
| 55 | The Mystery of the Secret Message | 1996 |
|---|
| 56 | The Firehouse Mystery | 1997 |
|---|
| 57 | The Mystery in San Francisco | 1997 |
|---|
| 58 | The Mystery at the Alamo | 1997 |
|---|
| 59 | The Outer Space Mystery | 1997 |
|---|
| 60 | The Soccer Mystery | 1997 |
|---|
| 61 | The Growling Bear Mystery | 1997 |
|---|
| 62 | The Mystery of the Lake Monster | 1998 |
|---|
| 63 | The Mystery at Peacock Hall | 1998 |
|---|
| 64 | The Black Pearl Mystery | 1998 |
|---|
| 65 | The Cereal Box Mystery | 1998 |
|---|
| 66 | The Panther Mystery | 1998 |
|---|
| 67 | The Mystery of the Stolen Sword | 1998 |
|---|
| 68 | The Basketball Mystery | 1999 |
|---|
| 69 | The Movie Star Mystery | 1999 |
|---|
| 70 | The Mystery of the Pirate's Map | 1999 |
|---|
| 71 | The Ghost Town Mystery | 1999 |
|---|
| 72 | The Mystery in the Mall | 1999 |
|---|
| 73 | The Gymnastics Mystery | 1999 |
|---|
| 74 | The Poison Frog Mystery | 2000 |
|---|
| 75 | The Mystery of the Empty Safe | 2000 |
|---|
| 76 | The Great Bicycle Race Mystery | 2000 |
|---|
| 77 | The Mystery of the Wild Ponies | 2000 |
|---|
| 78 | The Mystery in the Computer Game | 2000 |
|---|
| 79 | The Mystery at the Crooked House | 2000 |
|---|
| 80 | The Hockey Mystery | 2001 |
|---|
| 81 | The Mystery of the Midnight Dog | 2001 |
|---|
| 82 | The Summer Camp Mystery | 2001 |
|---|
| 83 | The Copycat Mystery | 2001 |
|---|
| 84 | The Haunted Clock Tower Mystery | 2001 |
|---|
| 85 | The Disappearing Staircase Mystery | 2001 |
|---|
| 86 | The Mystery on Blizzard Mountain | 2002 |
|---|
| 87 | The Mystery of the Spider's Clue | 2002 |
|---|
| 88 | The Mystery of the Mummy's Curse | 2002 |
|---|
| 89 | The Mystery of the Star Ruby | 2002 |
|---|
| 90 | The Stuffed Bear Mystery | 2002 |
|---|
| 91 | The Mystery at Skeleton Point | 2002 |
|---|
| 92 | The Tattletale Mystery | 2003 |
|---|
| 93 | The Comic Book Mystery | 2003 |
|---|
| 94 | The Ice Cream Mystery | 2003 |
|---|
| 95 | The Midnight Mystery | 2003 |
|---|
| 96 | The Mystery in the Fortune Cookie | 2003 |
|---|
| 97 | The Radio Mystery | 2003 |
|---|
| 98 | The Mystery of the Runaway Ghost | 2004 |
|---|
| 99 | The Finders Keepers Mystery | 2004 |
|---|
| 100 | The Mystery of the Haunted Boxcar | 2004 |
|---|
| 101 | The Clue in the Corn Maze | 2004 |
|---|
| 102 | The Ghost of the Chattering Bones | 2005 |
|---|
| 103 | The Sword of the Silver Knight | 2005 |
|---|
| 104 | The Game Store Mystery | 2005 |
|---|
| 105 | The Mystery of the Orphan Train | 2005 |
|---|
| 106 | The Vanishing Passenger | 2006 |
|---|
| 107 | The Giant Yo Yo Mystery | 2006 |
|---|
| 108 | The Creature in Ogopogo Lake | 2006 |
|---|
| 109 | The Rock and Roll Mystery | 2006 |
|---|
| 110 | The Secret of the Mask | 2007 |
|---|
| 111 | The Seattle Puzzle | 2007 |
|---|
| 112 | The Ghost in the First Row | 2007 |
|---|
| 113 | The Box that Watch Found | 2007 |
|---|
| 114 | A Horse Named Dragon | 2008 |
|---|
| 115 | The Great Detective Race | 2008 |
|---|
| 116 | The Ghost at the Drive-In Movie | 2008 |
|---|
| 117 | The Mystery of the Traveling Tomatoes | 2008 |
|---|
| 118 | The Spy Game | 2009 |
|---|
| 119 | The Dog-Gone Mystery | 2009 |
|---|
| 120 | The Vampire Mystery | 2009 |
|---|
| 121 | Superstar Watch | 2009 |
|---|
| 122 | The Spy in the Bleachers | 2010 |
|---|
| 123 | The Amazing Mystery Show | 2010 |
|---|
| 124 | The Pumpkin Head Mystery | 2010 |
|---|
| 125 | The Cupcake Caper | 2010 |
|---|
| 126 | The Clue in the Recycling Bin | 2011 |
|---|
| 127 | Monkey Trouble | 2011 |
|---|
| 128 | The Zombie Project | 2011 |
|---|
| 129 | The Great Turkey Heist | 2011 |
|---|
| 130 | The Garden Thief | 2012 |
|---|
| 131 | The Boardwalk Mystery | 2013 |
|---|
| 132 | The Mystery of the Fallen Treasure | 2013 |
|---|
| 133 | The Return of the Graveyard Ghost | 2013 |
|---|
| 134 | The Mystery of the Stolen Snowboard | 2014 |
|---|
| 135 | The Mystery of the Wild West Bandit | 2014 |
|---|
| 136 | The Mystery of the Soccer Snitch | 2014 |
|---|
| 137 | The Mystery of the Grinning Gargoyle | 2014 |
|---|
| 138 | The Mystery of the Missing Pop Idol | 2015 |
|---|
| 139 | The Mystery of the Stolen Dinosaur Bones | 2015 |
|---|
| 140 | The Mystery at the Calgary Stampede | 2015 |
|---|
| 141 | The Sleepy Hollow Mystery | 2015 |
|---|
| 142 | The Legend of the Irish Castle | 2016 |
|---|
| 143 | The Celebrity Cat Caper | 2016 |
|---|
| 144 | Hidden in the Haunted School | 2016 |
|---|
| 145 | The Election Day Dilemma | 2016 |
|---|
| 146 | The Doughnut Whodunit | 2018 |
|---|
| 147 | The Robot Ransom | 2018 |
|---|
| 148 | The Legend of the Howling Werewolf | 2018 |
|---|
| 149 | The Day of the Dead Mystery | 2018 |
|---|
| 150 | The Hundred-Year Mystery | 2019 |
|---|
| 151 | The Sea Turtle Mystery | 2019 |
|---|
| 152 | Secret on the Thirteenth Floor | 2019 |
|---|
| 153 | The Power Down Mystery | 2019 |
|---|
| 154 | Mystery at Camp Survival | 2020 |
|---|
| 155 | The Mystery of the Forgotten Family | 2020 |
|---|
| 156 | The Skeleton Key Mystery | 2020 |
|---|
| 157 | Science Fair Sabotage | 2020 |
|---|
| 158 | The Great Greenfield Bake-Off | 2021 |
|---|
| 159 | The Beekeeper Mystery | 2021 |
|---|
| 160 | The Mystery in the Magic Shop | 2022 |
|---|
| 161 | The Raptor Rescue | 2022 |
|---|
| 162 | The Code-Breaking Mystery | 2023 |
|---|
