This book contains nine short science fiction stories written by Arthur C. Clarke in the early part of his career. They are a good sample of the themes of his larger body of writing. Two stories here were later expanded into full-length novels. "The Sentinel" became
2001: A Space Odyssey and "Guardian Angel" became
Childhood's End. My three favorites are described below.
"Guardian Angel" follows the careful communications between Earth's representative and the leader of an alien delegation that has come to help us. As always, the devil's in details.
"Breaking Strain" is an interesting contrast to Tom Godwin's "The Cold Equations" published in 1954. It was written in 1948. Two spacefarers traveling to Venus survive a meteor strike to find their reserve oxygen gone--leaving not enough for both of them to reach their destination.
"The Sentinel" tells of an unexplained alien artifact uncovered on the Moon. As all Earth wonders who made this object, it creates quite an outcry.
The stories in this book are recommended as well-written and entertaining. I agree with another reviewer's recommendation to read them in The Collected Stories of Arthur C. Clarke along with more stories by this science fiction Master.