Sub-zero survival

Firefly & Fern Summary

Sub-zero Survival follows a teenage spy on a high-stakes adventure in one of the world's most dangerous frozen environments. Packed with action, intelligence tradecraft, and survival challenges, this thrilling tale will captivate young readers who love spy stories and edge-of-your-seat adventure. It's the perfect introduction to espionage fiction for teens ready for smart, fast-paced storytelling.