"Jack loves sleeping at Jem's house. He has so many cool games! But why is Jem acting so weird?"--P. [4] of cover.

Billie has always been best friends with Jack. But now Rebecca wants to be her best friend! Who will Billie choose?

Billie and her friends dare each other to explore the spooky house at the end of the street.

Billie and Jack are camping in Jack's backyard. But it's very dark. And maybe just a little bit scary. Are they really big enough to camp on their own?

Billie and the Secret Mystery Club are investigating their most serious mystery yet. Something has been taken from the principal's office at school! Who could have done such a terrible thing? And when one of Billie's friends becomes a suspect, will Billie even know who to trust anymore? --Back cover.

Billie loves Rebecca's older sisters. They make her feel so grown-up! But is Billie grown-up enough to handle the scary movies they like?

"Jack's whole class is coming to his birthday party. It's going to be awesome! But what will he do when his best friend is too sick to come?"--P. [4] of cover.

Someone has stolen all of the ripe strawberries from Mika's garden. The Secret Mystery Club is determined to work out who it was. Could it have been the gardener? Or was it the neighbours who just made a batch of strawberry jam? Whoever it was, they won't get far - not with the SMC on the case.