Tomb of the Zombie King (Seekers of the Lost Cavern #1)

It's not easy being Davern Cavern. Everyone in his family is a super-smart, super-brave explorer ... except for Davern. But when Davern's world-famous dad mysteriously disappears, it's up to Davern and his besties, Zara and Woop, to search where no-one else dares. Can Davern and his friends solve the mystery AND survive a zombie curse? And, most importantly, will there be enough brussels sprout sandwiches?!