May Allah bless you and your family
Lying – that is, not speaking the truth – is an evil trait. If God were to lie, then God would be a liar; that would mean that God committed an evil act. But God cannot commit an evil act because evil arises from ignorance or a need to deceive; in other words, evil arises from a need. Since God knows all things and has no need of anything, God does not commit evil. Thus, God does not lie and He is Truthful (al-Ṣādiq).
Regarding books. You may refer to Shaykh Jaʿfar Subhani’s Doctrines of Shiʿi Islam: A Compendium of Imami Beliefs and Practices (translated by Reza Shah-Kazemi), al-ʿAllāmah al-Hillī’s al-Bāb al-Hādī ʿAshar: A Treatise on the Principles of Shīʿite Theology (translated by William McElwee Miller), Shaykh Miṣbāh Yazdī’s Theological Instructions.