Amish Tripathis story telling style is unique and immersive. He writes in preface also, that its a multiple narrative style.So, you have to read all other books in the series to feel the essense and how the stories are linked.
Coming to Meluha ke mrityunjay which is a first part of Shiva triology. Personally, I have deep faith in Shiva. So, I compelled to read the story. All the mythological stories are woven in a realistic and digestible way. This book is about the journey of Shiva from his tribes to a different land and what happens afterwards. Some parts of text is so rich in sporituality that you understand the spiritual facts better because the way he potrayed it and at what point of time in the story. E.g. Synthesis of somras.
So, happy reading.