This can be found here http://www.torahdownloads.com/c-31-da-ma-shetashiv.html . Remarkably nuanced & intellectually honest, they explore fundamental Torah issues clearly and would be useful for questioning frum people.
Hat Tip: Ariel Segal
A response to ‘Naftali Zeligman,' who posted a number of serious attacks and questions attempting to disprove the veracity of Torah.