As to Baldacci books, the newest one, "The Innocent," is very engaging. The cast of characters begin with his earlier ones, so you'll miss some things.
Read "The Innocent" first anyway, then go back to earlier ones to find those where the characters start out.
Lee Child is new to me. BTW, heard on Huckabee tonight Phyllis Schafley talk about her new book: “No Higher Power: Obama’s War on Religious Freedom”. Ordered that tonight. Don't know how good it is, but it will be interesting.