"Skyserpents" by Jash Sen. This book is published by Duckbill in 2013 and has 268 pages. This is Book 2 of Wordkeepers trilogy. 

Anya and Bilal enter red plant of Kali, Vishasha, on Yaksha's back. They have an unexpected, unknown friend on the hostile planet who doesn't reveal his identity.  Their objective is to rescue their mother and retrieve the captured amulets. 

Will they survive? Will they succeed? Who are the sky serpents? What is Kali's objective? Who is the mysterious friend? Does Kali have a master? How is Kuber involved? Is Anya killed?

The story picks up from where Book1 ended. It obviously keeps you interesting. Author has used some very good ideas in the book like storing the amulets in ones subconscious, having secret discudsions in someone's memory instead of any of three loks etc. 

Sky serpents are unleashed. They have made their first two kills. Bilal has acquired his full potential. Anya has decided to do the supreme sacrifice. Alkapuri is discovered. By the end of he book stage is set for the epic battle between good and bad. The twist of Kali having another master is very interesting. 

Despite being Book 2, author has managed to maintain the momentum generated by Book 1. New characters enter while some characters make exit.

Cover illustration is interesting.

A good continuation. Recommend reading. But read it in order.