Happy
Hollisters #1 "The Happy Hollisters"
#2 on a River Trip
#3 at Sea Gull Beach
#4 and the Indian Treasure
#5 at Mystery Mountain
#6 at Snowflake Camp
#7 and the Trading Post Mystery
#8 at Circus Island
#9 and the Secret Fort
#10 at Pony Hill Farm
#11 and the Merry-Go Round Mystery
#12 and the Old Clipper Ship
#13 at Lizard Cove
#14 and the Scarecrow Mystery
#15 and the Mystery of the Totem Faces
#16 and the Ice Carnival Mystery
#17 and the Mystery in Skyscraper City
#18 and the Mystery of the Little Mermaid
#19 and the Mystery at Missle Town
#20 and the Cowboy Mystery
#21 the Haunted House Mystery
#22 the Secret of the Lucky Coins
#23 the Castle Rock Mystery
#24 the Cuckoo Clock Mystery
#25 the Swiss Icho Mystery
#26 the Sea Turtle Mystery
#27 the Punch and Judy Mystery
#28 the Whistle Pig Mystery
#29 the Ghost Horse Mystery
#30 the Mystery of the Golden Witch
#31 the Mystery of the Mexican Idol
#32 the Monster Mystery
#33 the Mystery of the Midnight Trolls