Promise of the Visitor by David B Gittlin is the third book in the Silver Sphere Series. The story begins dramatically with a man lying unconscious on the narrator's kitchen table. Following inquiries by the Sheriff's deputies, readers are informed about Arcon, an AI from another planet. With further revelations, we know that the AI has saved the Earth twice and is now expected to embark on another space mission. There have been reports of the third attack on Earth. The AI waits for another partner from the planet Aneleya. Arcon and the new visitor must fight the enemy warships and rescue innocent human beings. Soon after, the triad is joined by a female visitor from Aneleya who's here to safeguard humankind. Silenna, the female visitor, warns the narrator and his girlfriend of anticipated threats from a doomsday device. Meanwhile, Arcon is undetectable in tracing a warship but is later located on the other side of the Moon. Will they succeed in their space mission to shield Earth from the doomsday device?

The revelation of Arcon's purpose is straightforward, keeping the suspense going. Arcon's representation as a savior for Earth is impressive and engaging. The harmony between Arcon and the two humans is very well established, bringing coherence to the story. The conversations are vivid and capture the reader's interest. With the arrival of Silenna, the plot takes a twist, which provides the momentum for the nail-biting adventures. Along with anticipated action and warfare, there are segments of romance between the narrator and his girlfriend, which offer interludes in an eventful and action-packed narrative. Traces of humor are interspersed in between. David B Gittlin has made fantastic efforts in describing the unique natural settings, which gives a vibrant touch to the narrative. The descriptions of the spacesuits, interstellar details, and the details of the raids on the warship left a lasting impression on me. The events are very well tied together, with sequential action and no unnecessary exaggeration. Every element is well-knitted into the others and makes the Promises of the Visitor an entertaining read for all sci-fi and fantasy lovers.