Lion

Penguin Readers is an ELT graded reader series for learners of English as a foreign language. With carefully adapted text, new illustrations and language learning exercises, the print edition also includes instructions to access supporting material online.

Lion, a Level 4 Reader, is A2+ in the CEFR framework.  

Five-year-old Saroo gets on the wrong train in India and is taken thousands of miles to the city of Kolkata. After months of living on the streets, he is adopted by a family in Australia. Many years later, Saroo decides to try and find his Indian family.