Isle of Illusion is the fifth HeartQuest book, a series of "Pick a Path" interactive fantasy stories along the lines of TSR's earlier Endless Quest gamebooks. The main difference is the HeartQuest books combine traditional Dungeons & Dragons-style adventures with romance in an attempt to appeal to tweenage girls.

From the back cover:

You are Summer, a charming, feminine young woman seemingly meant for love and marriage. But you long to achieve greatness. You set out on a quest to dare what no man before you has attempted and survived. You are determined to stay the Moon Dragon! There are many who want to turn you from your perilous quest, but only one who wants to help.

He is Folc, a man who lives in the mountains and practices powerful magic. You will need his skill to survive your quest. You want his love to fulfill your life.

Will your adventure lead you to your first romance, or will your decisions carry you into realms from which there is no return? In a HEARTQUEST book, you, the reader, are challenged to PICK A PATH TO ROMANCE AND ADVENTURE.