Jain literature traditionally honors 24 Tirthankaras, with Mahavira being the 24th. A book titled “23 Tirthankar Bhagwan Charitra” would refer to the biographies of the 23 Tirthankaras preceding Mahavira, and such a compilation exists in various regional traditions (with differences between Digambara and Śvetāmbara views).

I can help you with:

• A simple, plain-language summary of the life-story (charitra) of each of the 23 Tirthankaras, keeping to Jain tradition.
• Notes on how Digambara and Śvetāmbara traditions differ in their retellings.
• Short excerpts or verses from authentic Jain sources if you specify which Tirthankar you’re most interested in.

If you’d like, I can start with a concise, Tirthankar-by-Tirthankar overview in easy-to-understand language.