"A Case of Sunburn" by Charles L. Fontenay is a science fiction short story published during the mid-20th century. The narrative revolves around a group of Martian rebels during a critical phase of their struggle against the oppressive Mars Corporation. With the fate of their rebellion hinging on a mysterious strategy known as Plan Blue, the characters confront imminent danger and betrayal as they attempt to carry out their mission. The story follows Jonner, who leads a small team of rebels on a risky undertaking to capture a Marscorp G-boat and secure a spaceship known as The Egg. As they navigate challenges, including the presence of a possible spy among them, they ultimately find themselves caught between the rebel cause and the might of Marscorp. With unexpected twists involving espionage and the repercussions of a rare astronomical event, the narrative culminates in a revelation about the significance of The Egg in thwarting the enemy's capabilities. The outcome showcases clever strategy and highlights the unintended effects of the Earth-sun conjunction on the battle for Mars. (This is an automatically generated summary.)