As part of her adventure, Wren is transformed bodily into a dog,[7] and must decide whether to abandon her quest or try to turn her new shape to the advantage, at great risk of losing her human identity in the process.

Wren to the Rescue tells the story of an orphan girl who learns her best friend and purportedly fellow-orphan Tess, is in fact Teresa Rhisadel, princess and sole heiress of the neighbouring country of Meldrith.

At the next major stop on their journey of rescue, Horth Falls Town, Wren and Tyron encounter another prominent sympathizer to the Princess’ plight, Connor Shaltar, also technically a prince of another land, whose provisions breath new hope into the mission.

The international scope of the conflict becomes clear as debate over a retaliatory invasion against Senna Lirwan heightens in Cantirmoor, ad interim Wren's rescue party faces an escalating variety of threats as they make their way into, in to, and through, the border mountains.

Wren defies the directive of hastening home to be restored human before her mind is lost forever, instead electing to expand her rescue mission to include all of her friends now bound in the highest tower of Edrann.