In this multi-part series, Diana and Phoebe explore the emotional roots of the Beatles break-up with a focus on Lennon/McCartney. They use John's and Paul's contemporaneous words and behaviors to challenge the traditional narrative and show how this delicate negotiation for love and security went disastrously awry. In the first installment, they begin their re-examination by tracing the Big Bang of the break-up to 1968. This is Part 1.A, which focuses on the first half of the year; Part 1.B will focus on the second.