The Lost Stone (The Kingdom of Wrenly Series) by Jordan Quinn

In the Lost Stone, we meet Prince Lucas, a lonely 8 year-old boy who longs to make friends and go on adventures. Clara, the daughter of the queen's seamstress, knows the kingdom well and becomes fast friends with Lucas!  When Queen Tasha's emerald goes missing, the king offers a handsome reward.  Lucas and Clara team up to explore all the lands of Wrenly.  They encounter fairies on the island of Primlox, trolls on the island of Burth, dragons on the island of Crestwood, wizards on the island of Hobsgrove, and finally... Mermaid's Cove!  Do Lucas and Clara outsmart the tricky trolls?  Are they able to nurse a baby dragon back to health?  Do they ever find the lost emerald?  Check out this fun series that is perfect for emerging chapter book readers or can be read aloud to a younger audience.  The chapters are short and most every page is illustrated.