The Last Days of Socrates

Plato is an artist in his own right. His arguments may not be all that convincing to modern readers, but the way he pulls you through the arguments is unparalleled, regardless of if they're repurposed from Socrates (like possibly in the Euthyphro and the Apology) or if they come straight from him (like is theorized about the Phaedo)

I will say, I was surprised in reading this that I found a few arguments that could still be used by modern audiences. But regardless, a good starting point for my getting into philosophy.