Happy Hollisters and the Mystery of the Golden Witch Happy Hollisters and the Mystery of the Golden Witch 4.01 2023
The Happy Hollisters and the Swiss Echo Mystery The Happy Hollisters and the Swiss Echo Mystery 4.01 2019
Happy Hollisters and the Mystery of the Midnight Trolls Happy Hollisters and the Mystery of the Midnight Trolls 4.01 2023
The Happy Hollisters and the Secret of the Lucky Coins #22 in series The Happy Hollisters and the Secret of the Lucky Coins #22 in series 4.01 1963
The Happy Hollisters And The Trading Post Mystery #7 in series The Happy Hollisters And The Trading Post Mystery #7 in series 4.01 1954
The Happy Hollisters and the Mystery of the Little Mermaid #18 in the series The Happy Hollisters and the Mystery of the Little Mermaid #18 in the series 4.01 1960
The Happy Hollisters and the Punch and Judy Mystery #27 in series The Happy Hollisters and the Punch and Judy Mystery #27 in series 4.01 1964
The Happy Hollisters and the Sea Turtle Mystery The Happy Hollisters and the Sea Turtle Mystery 4.01 2018
The Happy Hollisters and the Mystery of the Totem Faces The Happy Hollisters and the Mystery of the Totem Faces 3 readers 2016
The Happy Hollisters and the Old Clipper Ship The Happy Hollisters and the Old Clipper Ship 2 readers 2013
The Happy Hollisters and the Mystery in Skyscraper City The Happy Hollisters and the Mystery in Skyscraper City 1 readers 2017
The Happy Hollisters at Mystery Mountain #5 in series The Happy Hollisters at Mystery Mountain #5 in series 1 readers 1954