Earthweeds (Sons of Neptune Book 1) – Rod Little

Post-apocalyptic, alien invasion thriller: When humanity vanishes, a group of survivors must unravel the mystery while defending themselves from hordes of creatures swarming the planet, fighting each other for the remaining food supply. The humans must take sides, forming an alliance with Earth’s own creatures, and two boys with special gifts may change our world’s fate. “Heart-pounding sci-fi series!”