Srimad Ramayanam

The Ramayana is a Sanskrit epic poem ascribed to the Hindu sage and Sanskrit poet Valmiki. It depicts the duties of relationships, portraying ideal characters like the ideal father, the ideal servant, the ideal brother, the ideal wife and the ideal king. The name Ramayana is a tatpurusha compound of Rāma and ayana ("going, advancing"), translating to "Rama's Journey". The Ramayana consists of 24,000 verses in seven books (kāṇḍas) and 500 cantos (sargas) and tells the story of Rama (the seventh avatar of the Hindu supreme-god Vishnu), whose wife Sita is abducted by Ravana, the king of Lanka (current day Sri Lanka). 
Incidentally the first letter of every 1000 verses (total 24) make the Gayatri mantra. Thematically, the Ramayana explores human values and the concept of dharma.
Easily navigate through chapters, making it accessible for readers of all ages.